Space Exploration Archives

June 15, 2015December 23, 2015 by Ken Kremer

First Interplanetary CubeSats to Launch on NASA’s 2016 InSight Mars Lander

NASA’s two small MarCO CubeSats will be flying past Mars in 2016 just as NASA’s next Mars lander, InSight, is descending to land on the surface. MarCO, for Mars Cube One, will provide an experimental communications relay to inform Earth quickly about the landing. Credits: NASA/JPL-Caltech
See fly by and cubesat spacecraft graphics and photos below[/caption]

CubeSats are taking the next great leap for science – departing Earth and heading soon for the fourth rock from the Sun.

For the first time, two tiny CubeSat probes will launch into deep space in early 2016 on their first interplanetary expedition – aiming for the Red Planet as part of an experimental technology relay demonstration project aiding NASA’s next Mission to Mars; the InSight lander.

NASA announced the pair of briefcase-sized CubeSats, called Mars Cube One or MarCO, as a late and new addition to the InSight mission, that could substantially enhance communications options on future Mars missions. They were designed and built by NASA’s Jet Propulsion Laboratory (JPL), Pasadena, California.

InSight, which stands for Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport, is a stationary lander. It will join NASA’s surface science exploration fleet currently comprising of the Curiosity and Opportunity missions which by contrast are mobile rovers.

InSight is the first mission to understand the interior structure of the Red Planet. Its purpose is to elucidate the nature of the Martian core, measure heat flow and sense for “Marsquakes.”

The full-scale mock-up of NASA's MarCO CubeSat held by Farah Alibay, a systems engineer for the technology demonstration, is dwarfed by the one-half-scale model of NASA's Mars Reconnaissance Orbiter behind her. Credits: NASA/JPL-Caltech — The full-scale mock-up of NASA’s MarCO CubeSat held by Farah Alibay, a systems engineer for the technology demonstration, is dwarfed by the one-half-scale model of NASA’s Mars Reconnaissance Orbiter behind her. Credits: NASA/JPL-Caltech

Because of their small size – roughly 4 inches (10 centimeters) square) – and simplicity using off-the-shelf components, they are a favored platform for university students and others seeking low cost access to space – such as the Planetary Society’s recently successful Light Sail solar sailing cubesat demonstration launched in May. Six units are combined together to create MarCO.

Over the past few years many hundreds of cubesats have already been deployed in Earth orbit – including many dozens from the International Space Station (ISS) – but these will be the first going far beyond our Home Planet.

Data relayed by MarCO at 8 kbps in real time could reveal InSight’s fate on the Martian surface within minutes to mission controllers back on Earth, rather than waiting for a potentially prolonged period of agonizing nail-biting lasting an hour or more.

The two probes, known as MarCO-A and MarCO-B, will operate during InSight’s highly complex entry, descent and landing (EDL) operations as it descends through the thin Martian atmosphere. Their function is merely to quickly relay landing data. But the cubesats will have no impact on the ultimate success of the mission. They will intentionally sail by but not land on Mars.

“MarCO is an experimental capability that has been added to the InSight mission, but is not needed for mission success,” said Jim Green, director of NASA’s planetary science division at the agency’s headquarters in Washington, in a statement.

The MarCO Cubesats will serve as a test bed for a revolutionary communications mode that seeks to quickly relay data back to Earth about the status of InSight – in real time – as it plummets down to the Red Planet for the “Seven Minutes of Terror” that hopefully climaxes with a soft landing.

The MarCO duo will fly by past Mars at a planned distance and altitude of about 3,500 kilometers as InSight descends towards the surface during EDL operations. They will rapidly retransmit signals coming from the lander in real time, directly back to NASA’s huge Deep Space Network (DSN) receiving dish antennas back on Earth.

MarCO cubesats fly by trajectory for rapid communications relay as NASA’s InSight spacecraft lands on Mars in September 2016. Credit: NASA/JPL-Caltech

For this flight, six cubesats will be joined together to provide the additional capability required for the journey to Mars and to accomplish their communications task.

The six-unit MarCO CubeSat has a stowed size of about 14.4 inches (36.6 centimeters) by 9.5 inches (24.3 centimeters) by 4.6 inches (11.8 centimeters) and weighs 14 kilograms.

The solar powered probes will be outfitted with UHF and X-band communications gear as well as propulsion, guidance and more.

The overall cost to design, build, launch and operate MarCO-A and MarCO-B is approximately $13 million, a NASA spokesperson told Universe Today.

InSight and MarCO are slated to blastoff together on March 4, 2016 atop a United Launch Alliance Atlas V rocket from Vandenberg Air Force Base, California.

After launch, both MarCO CubeSats will separate from the Atlas V booster and travel along their own trajectories to the Red Planet.

“MarCO will fly independently to Mars,” says Green.

They will be navigated independently from InSight. They will all reach Mars at approximately the same time for InSight’s landing slated for Sept. 28, 2016.

MarCO’s two solar panels and two radio antennas will unfurl after being released from the Atlas booster. The high-gain, X-band antenna is a flat panel engineered to direct radio waves the way a parabolic dish antenna does,” according to a NASA description.

The softball-size radio “provides both UHF (receive only) and X-band (receive and transmit) functions capable of immediately relaying information received over UHF.”

MarCO cubesat graphic annotated to show dimensions, instruments, physical characteristics and capabilities. Credit: NASA/JPL-Caltech

During EDL, InSight will transmit landing data via UHF radio to the MarCO cubesats sailing past Mars as well as to NASA’s Mars Reconnaissance Orbiter (MRO) soaring overhead.

MarCO will assist InSight by receiving the lander information transmitted in the UHF radio band and then immediately forward EDL information to Earth using the X-band radio. By contrast, MRO cannot simultaneously receive information over one band while transmitting on another, thus delaying confirmation of a successful landing possibly by an hour or more.

Engineers for NASA's MarCO technology demonstration display a full-scale mechanical mock-up of the small craft in development as part of NASA's next mission to Mars. Mechanical engineer Joel Steinkraus and systems engineer Farah Alibay are on the team at NASA's Jet Propulsion Laboratory, Pasadena, California, preparing twin MarCO (Mars Cube One) CubeSats for a March 2016 launch. Credit: NASA/JPL-Caltech — Engineers for NASA’s MarCO technology demonstration display a full-scale mechanical mock-up of the small craft in development as part of NASA’s next mission to Mars. Mechanical engineer Joel Steinkraus and systems engineer Farah Alibay are on the team at NASA’s Jet Propulsion Laboratory, Pasadena, California, preparing twin MarCO (Mars Cube One) CubeSats for a March 2016 launch. Credit: NASA/JPL-Caltech

“Ultimately, if the MarCO demonstration mission succeeds, it could allow for a “bring-your-own” communications relay option for use by future Mars missions in the critical few minutes between Martian atmospheric entry and touchdown,” say NASA officials.

It’s also very beneficial and critical to the success of future missions to have a stream of data following the progress of past missions so that lessons can be learned and applied, whatever the outcome.

“By verifying CubeSats are a viable technology for interplanetary missions, and feasible on a short development timeline, this technology demonstration could lead to many other applications to explore and study our solar system,” says NASA.

InSight will smash into the Martian atmosphere at high speeds of approximately 13,000 mph in September 2016 and then decelerate within a few minutes for landing via a heat shield, retro rocket and parachute assisted touchdown on the plains at flat-lying terrain at “Elysium Planitia,” some four degrees north of Mars’ equator, and a bit north of the Curiosity rover.

As I reported in recently here, InSight has now been assembled into its flight configuration and begun a comprehensive series of rigorous environmental stress tests that will pave the path to launch in 2016 on a mission to unlock the riddles of the Martian core.

The countdown clock is ticking relentlessly towards liftoff in less than nine months time in March 2016.

NASA's InSight Mars lander spacecraft in a Lockheed Martin clean room near Denver. As part of a series of deployment tests, the spacecraft was commanded to deploy its solar arrays in the clean room to test and verify the exact process that it will use on the surface of Mars. Credits: NASA/JPL-Caltech/Lockheed Martin — NASA’s InSight Mars lander spacecraft in a Lockheed Martin clean room near Denver. As part of a series of deployment tests, the spacecraft was commanded to deploy its solar arrays in the clean room to test and verify the exact process that it will use on the surface of Mars. Credits: NASA/JPL-Caltech/Lockheed Martin

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

June 15, 2015December 23, 2015 by Mark Mortimer

Book Review:”Interplanetary Outpost: The Human and Technological Challenges of Exploring the Outer Planets”

While many visionaries now focus upon Mars as the next destination for humankind to visit, some have an even longer view. In the book, “Interplanetary Outpost: The Human and Technological Challenges of Exploring the Outer Planets,” you can take a ride with the author Erik Seedhouse to possibly the next most habitable body in our solar system. You can visit Callisto in the Jovian system. However, on reading this book you will quickly discover that it won’t be a simple journey there and back again.

Imagine yourself wanting to get involved with that first trip to Callisto. What would you do? Where would you begin? Well, this book could be a really good high level overview for the requirements for your endeavour.

First, it reminds you on why Callisto is the best target. Here it draws upon earlier NASA efforts, including RASC-Revolutionary Aerospace Systems Concepts and HOPE-Human Outer Planet Exploration. It also continually references recent movies like Avatar and Pandorum as supporting work. With the references aside, the book settles down and focuses you upon its prime directive, a one-off exploration endeavor, even smaller than the multiple missions of Apollo to the Moon. Therefore, much of the book’s information serves to satisfy this one-off.

As you read, you will discover more and more requirements and pre-conditions. For example, according to this book, you will be departing from a spaceport parked in CIS-Lunar orbit. You will travel on the optimal path to arrive at Callisto without hitting Jupiter or being affected by its radiation fields. You will use electrical onboard power from a nuclear generation system. Your craft will be powered by a variable specific impulse magnetoplasma rocket. Your body will be suspended cryogenically on the flight. Your body will be filled with nano-biomechanical devices so that you are in functional shape when you arrive. An onboard computer (not named HAL) will sustain both your sleeping body and the spacecraft on its multiyear journey. And so the book’s list of pre-conditions continues on. Thus, as you can well imagine, the book takes you along a path that perhaps is more akin to science fiction than science fact even though it argues that the technologies are all nearly-here! Topping this list is the submersible that launches you into the ice-covered oceans of Callisto. In any case, humankind will have to do a huge amount of prior development before you ever get to this Jovian moon; at least according to this book.

The book’s reliance upon un-proven or even non-existent technology is what will likely either make or break it for you. In effect, the book reads as if the author accumulated a large number of scientific research papers and turned them into a comprehensive, very entertaining prose for the general audience. If you want to be entertained, then this book is for you. If you want to get into a bit more of the nitty gritty, well then you may be less entertained. For example, the book has an expectation that explorers on Callisto will utilize GPS receivers to help them navigate. But, there is no mention of a GPS satellite constellation orbiting Callisto. And what about cryogenics? While the book does mentions some ongoing research today, we certainly don’t consider it mainstream. You may learn of new words like ‘respirocytes’. This knowledge could serve you well at cocktail parties but may not get you much headway at the next meeting of the local astronomical society. So, this reliance upon un-proven or non-existent technology should be kept in mind before you read this book.

However, at one time, some people were imaginative enough, or brave enough, to envision humankind doing more than staying upon planet Earth. Sure the Moon is close and Mars is apparently only slightly further. But there’s a whole universe out there just waiting for us. Are you sure what might be the best path for our species? Take a read of Erik Seedhouse’s book “Interplanetary Outpost – The Human and Technological Challenges of Exploring the Outer Planets”. It might change your perspective as it takes you on a ride the likes of which will never have been seen on Earth before.

This book is available from Springer.

Learn more about the author Erik Seedhouse at Astronauts4Hire.org

June 14, 2015December 23, 2015 by Bob King

Philae Wakes Up, Makes Contact!

Philae may have woken up even earlier, but yesterday afternoon the lander contacted Earth for the first time since November. Credit: ESA

Fantastic news! Philae’s alive and kicking. The lander “spoke” with its team on ground via Rosetta for 85 seconds — its first contact since going into hibernation in November.

Signals were received at ESA’s European Space Operations Center in Darmstadt at 4:28 p.m. EDT yesterday June 13. The lander sent more than 300 data packets reporting on its condition as well as information about the comet.

“Philae is doing very well. It has an operating temperature of -35ºC (-31°F) and has 24 watts available,” said DLR Philae Project Manager Dr. Stephan Ulamec. “The lander is ready for operations.”

Philae spent two hours drifting above Comet 67P/C-G after its harpoons failed to anchor it to the surface. Credit: ESA

If coming out of hibernation isn’t surprising enough, it appears Philae has been awake for a while because it included historical data along with its current status in those packets. There are still more than 8000 data packets in Philae’s mass memory which will give the mission scientists information on what happened to the lander in the past few days on Comet 67P/C-G.

Philae went into hibernation on November 15, 2014 after running out of battery power. Credit: ESA

Philae shut down on November 15 after about 60 hours of operation on the comet after landing at the base of a steep cliff in a shaded area that prevented the solar panels from charging its batteries. Since March 12, the Rosetta lander has been “listening” for a signal from the lost lander.

First image taken by Philae after landing on the comet on November 12, 2015. It shows a steep cliff and one of the lander's legs. Credit: ESA/ROSETTA/PHILAE/CIVA — First image taken by Philae after landing on Comet 67P/Churyumov-Gerasimenko on November 12, 2014 showing a steep cliff and one of the lander’s legs. Credit: ESA/ROSETTA/PHILAE/CIVA

Throughout, mission scientists remained hopeful that the comet’s changing orientation and increase in the intensity of sunlight as it approached perihelion would eventually power up the little lander. Incredible that it really happened.

Yesterday, we looked at the many attempts to find Philae. A day later it’s found us!

Both amateurs and professional astronomers across the world are in constant contact sharing observations of Comet 67P/C-G and news from the Rosetta mission. Klim Churyumov, co-discoverer of the comet, had this to say upon hearing the news of Philae’s awakening:

“Hurrah! Hurrah! Hurrah! Landing probe Philae awake! Everybody, please accept my sincere congratulations! It happened on 13 June 2015 in the day of birthday of my mother – Antonina Mikhailovna (108 years have passed since the day of her birth). And I’m starting from 13 November 2014 to this day, every morning pronounced a short prayer: “Lord, please wake Philae and support Rosetta”. God and the Professional Navigators woke Philae! It is fantastic! All the best! – Klim Churyumov.

How poignant Philae awoke on Klim’s mother’s birthday!

Padma A. Yanamandra-Fisher, Rosetta Coordinator of Amateur Observations for 67P/C-G (and Senior Research Scientist at the Space Science InstituteKlim Churyumov, at the ACM meeting in Helsinki — Padma Yanamandra-Fisher (left), Senior Research Scientist at the Space Science Institute, who runs the PACA site, and comet co-discoverer Klim Churyumov. Courtesy Padma Yanamandra-Fisher

Churyumov made his statement on the Pro-Am Collaborative Astronomy (PACA) site devoted to pro-amateur collaboration during comet observing campaigns. I encourage you to check out the group and participate by submitting your own observations of Comet 67P as it brightens this summer and early fall.

* UPDATE: In the coming days, the mission teams will reestablish contact with Philae and increase the amount of time it can “talk” with the lander. Once regular contact is established, science observations can begin again. Slowly. One instrument at a time.

The first instruments activated, those measuring temperature, magnetic fields and electrical conductivity on the comet, make small demands on Philae’s power. Slightly more power-hungry operations like picture taking and radio ranging will follow. Using the images and new data, scientists should be able to pinpoint the lander’s location.

After these steps, mission engineers will attempt to recharge the probe’s drained batteries to fire up its ovens (used to heat samples to determine their composition) and run the drill to collect fresh material.

Here’s a cool link to see LIVE telemetry from Philae.

June 13, 2015December 23, 2015 by Ken Kremer

Station Astronaut Snaps Super Sharp View of the Great Pyramids from Space

The Great Egyptian Pyramids of Giza from space and the International Space Station on 10 June 2015. “It took me until my last day in space to get a good picture of these!
Credit: NASA/Terry Virts/@AstroTerry
See Pyramid map below[/caption]

On his last full day in space aboard the International Space Station (ISS), NASA astronaut Terry Virts at last captured a truly iconic shot of one of the “Seven Wonders of the World” – the Great Pyramids of Giza in Egypt.

Virts snapped the exquisitely sharp view of the Egyptian pyramids at Giza on June 10 looking out from the stations windows, just hours before entering the Soyuz return spaceship and closing the hatches behind him for his planned plummet back to Earth.

He proudly posted the spectacular photo on his twitter social media account from space while serving as station commander of Expedition 43.

The three pyramids of Giza dominate the fantastically beautiful photo. They are located about 9 km (5 mi) from the town of Giza on the Nile, and some 25 km (15 mi) southwest of the Egyptian capital city of Cairo.

The Great Sphinx is also located nearby the massive complex of the Great Pyramids and visible in the stunning photo. See map below.

Map of Giza pyramid complex - "Pyramid of Khufu" refers to the Great Pyramid. — Map of Giza pyramid complex – “Pyramid of Khufu” refers to the Great Pyramid.

Virts and his international crewmates from Russia and Italy just returned home safely to a sun drenched and toasty touchdown on the remotes steppes of Kazakhstan on June 11, after departing from the massive orbiting complex aboard their Russian Soyuz TMA-15M ferry craft.

Apparently the Pyramid photo proved to be quite elusive – as it took Virts the entire length of his six months duration flight to finally take the stunning close up photo he longed for and achieved, with no time left to spare.

“It took me until my last day in space to get a good picture of these!” tweeted Virts from the ISS on June 11.

NASA Astronaut Terry Virts inside the Cupola, commanded just completed Expedition 43 during over 199 days aboard the ISS. Credit: NASA

The multinational Expedition 43 trio comprised Commander Terry Virts of NASA, Flight Engineers Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of ESA (European Space Agency).

They undocked from the orbiting outposts Russian Rassvet module as scheduled in the Soyuz TMA-15M spaceship at 6:20 a.m. EDT, June 11, while soaring some 250 miles (400 kilometers) above Mongolia.

Earlier in the mission, Cristoforetti captured a wider angle view of the Great Pyramids of Giza, shown for comparison below. Modern civilization juts up very near to the ancient pyramids.

The Egyptian Pyramids of Giza from space and the ISS. ESA/Samantha Cristoforetti — The Egyptian Pyramids of Giza from space and the ISS. Credit: ESA/Samantha Cristoforetti

The largest pyramid, known as the Great Pyramid or Pyramid of Khufu was built over around 10 to 20 years and completed around 2560 BC. It measured about 146.5 meters (481) feet in height when it was originally built. At the base it has a width of 230.4 meters (765 feet).

Altogether, the Expedition 43 crew served nearly 200 days on board the ISS.

During his just concluded stay aboard the ISS during Expedition 43, Virts did three spacewalks totaling 19 hours and 2 minutes. Including the nearly 200 day mission, he raised has total cumulative time in space to 212 days.

Virts was a prolific photographer during his duty time in orbit. A few more of his shots are gathered included herein, including one of many nighttime photos, a shot of the Soyuz return vehicle and his very last shot, a magnificent view out the stations windows.

“The last picture I took on this mission.” Credit: NASA: Terry Virts/@AstroTerry — “The last picture I took on this mission.” Credit: NASA/Terry Virts/@AstroTerry

The Expedition 43 flight was extended at the last minute due to the surprise launch failure of a Russian rocket carrying a station bound Progress resupply ship in late April.

The Progress 59 cargo vessel, also known as Progress M-27M, spun wildly out of control as it separated from the Soyuz-2.1A carrier rocket. The freighter and all its 2.5 tons of contents for the crew were destroyed during an uncontrolled plummet as its crashed back to Earth on May 8.

As a direct result of the mission extension, Cristoforetti now holds the single mission space record for a female astronaut, of nearly 200 days.

On June 6, Cristoforetti surpassed the female astronaut record of 194 days, 18 hours and 2 minutes established by NASA astronaut Sunita Williams on a prior station flight back in 2007.

Expedition 43 marked Cristoforetti first foray into space and she is also the first female Italian astronaut.

With the departure of the Virts crew, three people remain on board to start Expedition 44. They comprise NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko, the two members of the first “ISS 1 Year Mission” as well as cosmonaut Gennady Padalka.

The next three person crew is due to blastoff in a Soyuz around July 23 to 25 to restote the station to a full complement of six.

The next cargo ferry flight involves NASA’s next contracted unmanned Dragon cargo mission by commercial provider SpaceX on the CRS-7 flight. Dragon CRS-7 is now slated for liftoff on June 26. Watch for my onsite reports from KSC.

The Dragon will be carrying critical US equipment, known as the International Docking Adapter (IDA), enabling docking by the SpaceX Crew Dragon and Boeing CST-100 astronaut transporters – due for first crewed launches in 2017.

The most recent unmanned Dragon cargo CRS-6 mission concluded with a Pacific Ocean splashdown on May 21.

“My ride back to Earth today.” Soyuz ferry craft touched down safe on 11 June 2015. Credit: NASA: Terry Virts/@AstroTerry — “My ride back to Earth today.” Soyuz ferry craft touched down safe on 11 June 2015. Credit: NASA/Terry Virts/@AstroTerry

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

Soyuz departs on 11 June 2015. “Fair winds and following seas to my good friends @AstroTerry, @AstroSamantha, and @AntonAstrey.” Credit: NASA/Scott Kelly

June 11, 2015December 23, 2015 by Ken Kremer

Record Setting Italian Female Astronaut and ISS Crewmates Land in Sunny Kazakhstan

The Soyuz TMA-15M spacecraft is seen as it lands with Expedition 43 commander Terry Virts of NASA, cosmonaut Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos), and Italian astronaut Samantha Cristoforetti from European Space Agency (ESA) near the town of Zhezkazgan, Kazakhstan on Thursday, June 11, 2015. Virtz, Shkaplerov, and Cristoforetti are returning after more than six months onboard the International Space Station where they served as members of the Expedition 42 and 43 crews. Photo Credit: (NASA/Bill Ingalls)

An international crew comprising a Russian cosmonaut, a US astronaut and an Italian astronaut who accomplished a record setting flight for time in space by a female, departed the International Space Station (ISS) earlier today, June 11, and safely landed in sunny and warm Kazakhstan tucked inside their Russia Soyuz ferry ship after a successful and extended 199-day mission devoted to science and station upgrades.

The multinational trio comprising Expedition 43 Commander Terry Virts of NASA, Flight Engineers Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of ESA (European Space Agency) undocked from the orbiting outposts Russian Rassvet module as scheduled in the Soyuz TMA-15M spaceship at 6:20 a.m. EDT while soaring some 250 miles (400 kilometers) above Mongolia.

A four-minute 40-second deorbit burn at 8:51 a.m EDT slowed the craft for the fiery reentry into the Earth’s atmosphere.

The crew touched down just a few hours after undocking at 9:44 a.m. EDT (7:44 p.m., Kazakh time), southeast of the remote town of Dzhezkazgan on the steppes of Kazakhstan, about an hour and a half before sundown in delightfully summer weather. Temperatures today were in the 80s, but they are ‘bone chilling’ in the winter months.

Expedition 43 Commander Terry Virts of NASA, Flight Engineers Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of ESA (European Space Agency) touched down at 9:44 a.m. EDT (7:44 p.m., Kazakh time), southeast of the remote town of Dzhezkazgan in Kazakhstan. Credits: NASA TV

The Expedition 43 flight was extended at the last minute due to the surprise launch failure of a Russian rocket carrying a station bound Progress resupply ship in late April.

The Progress 59 cargo vessel, also known as Progress M-27M, spun wildly out of control as it separated from the Soyuz-2.1A carrier rocket. The freighter and all its 2.5 tons of contents fpr the crew were destroyed during an uncontrolled plummet as its crashed back to Earth on May 8.

The Soyuz/Progress 59 failure had far reaching consequences and resulted in a postponement of virtually all Russian crew and cargo flights to the ISS for the remainder of 2015, as announced this week by Roscosmos, the Russian Federal Space Agency.

One result is that Cristoforetti now holds the single mission record for a female astronaut, of nearly 200 days.

Expedition 43 was extended by about a month in the wake of the launch failure of the Progress 59 cargo vessel, which quickly cascaded into an extended mission from its originally planned length of about 170 days to 199+ days.

The Soyuz is only certified to stay on orbit for 200 days. So the return home delayed as much as possible to minimize the time when the ISS reverts to only a three person crew – and consequently reduced time for research.

This past weekend on June 6, Cristoforetti surpassed the female astronaut record of 194 days, 18 hours and 2 minutes established by NASA astronaut Sunita Williams on a prior station flight back in 2007.

Cristoforetti, of the European Space Agency (ESA), is on her first ever space flight also counts as she also counts as Italy’s first female astronaut.

The station departure and parachute assisted soft landing was shown during a live webcast on NASA TV.

“The landing was on time and on target after over 199 days in space,” said NASA commentator Rob Navius.

“Everything went by the book for an on target touchdown. The crew is safely back on Earth!”

Flight Engineer Samantha Cristoforetti of the European Space Agency in Star Trek uniform as SpaceX Dragon arrives at the International Space Station on April 17, 2015. Credit: NASA

In the final stages of the return to Earth, the Soyuz descent module glided down safely using a single mammoth orange and white parachute, aided by braking rockets in the final moments just a few feet above ground.

The Soyuz landed upright, which eased the extraction of the crew. Russian recovery team members hoisted all three up and out from the cramped capsule.

Soyuz commander Anton Shkaplerov was hauled up first, followed by Samantha Cristoforetti and finally Terry Virts.

All three crewmembers were healthy and happy, each signaling their elation with a joyous ‘thumbs up.’

After preliminary medical checks, the crew were flown by helicopter to a staging base at Karaganda. From there they split up. Shkaplerov heads back to Moscow and Star City. Cristoforetti and Virts fly to Mission Control in Houston.

During their time aloft, the crew completed several critical spacewalks, technology demonstrations, and hundreds of scientific experiments spanning multiple disciplines, including human and plant biology,” according to NASA.

Among the research experiments conducted were “participation in the demonstration of new, cutting-edge technologies such as the Synthetic Muscle experiment, a test of a new polymer that contracts and expands similar to real muscle. This technology has the potential for future use on robots, enabling them to perform tasks that require considerable dexterity but are too dangerous to be performed by humans in space.”

“The crew engaged in a number of biological studies, including one investigation to better understand the risks of in-flight infections and another studying the effects microgravity has on bone health during long-duration spaceflight. The Micro-5 study used a small roundworm and a microbe that causes food poisoning in humans to study the risk of infectious diseases in space, which is critical for ensuring crew health, safety and performance during long-duration missions. The Osteo-4 study investigated bone loss in space, which has applications not only for astronauts on long-duration missions, but also for people on Earth affected by osteoporosis and other bone disorders.”

Three cargo flights also arrived at the ISS carrying many tons of essential supplies, research equipment, science experiments, gear, spare parts, food, water, clothing.

The resupply freighters included the Russian Progress in February 2015 as well as two SpaceX Dragon cargo ships on the CRS-5 and CRS-6 flights in January and April.

Expedition 43 commander Terry Virts of NASA, left, cosmonaut Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos), center, and Italian astronaut Samantha Cristoforetti from European Space Agency (ESA) sit in chairs outside the Soyuz TMA-15M spacecraft just minutes after they landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, June 11, 2015. Virtz, Shkaplerov, and Cristoforetti are returning after more than six months onboard the International Space Station where they served as members of the Expedition 42 and 43 crews. Photo Credit: (NASA/Bill Ingalls) — Expedition 43 commander Terry Virts of NASA, left, cosmonaut Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos), center, and Italian astronaut Samantha Cristoforetti from European Space Agency (ESA) sit in chairs outside the Soyuz TMA-15M spacecraft just minutes after they landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, June 11, 2015. Virts, Shkaplerov, and Cristoforetti are returning after more than six months onboard the International Space Station where they served as members of the Expedition 42 and 43 crews. Photo Credit: (NASA/Bill Ingalls)

With the return of Virts crew, the new Expedition 44 begins and comprises NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko, the two members of the first “ISS 1 Year Mission” as well as cosmonaut Gennady Padalka.

Padalka now assumes command of the station for a record setting fourth time. And he’ll soon be setting another record. In late June, he will break the all time record for cumulative time in space currently held by cosmonaut Sergei Krikalev of 803 days on six space flights.

When Padalka returns to Earth around September 10 in the Soyuz TMA-16M ship, that brought the 1 Year crew to the ISS, he will have been in space for a grand total of over 877 days over five flights.

The next cargo ferry flight involves NASA’s next contracted unmanned Dragon cargo mission by commercial provider SpaceX on the CRS-7 flight.

Dragon CRS-7 is now slated for liftoff on June 26. Watch for my onsite reports from KSC.

The most recent unmanned Dragon cargo CRS-6 mission concluded with a Pacific Ocean splashdown on May 21.

The International Space Station, photographed by the crew of STS-132 as they disembarked. Credit: NASA

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

Expedition 43 crews rests post landing on Thursday, June 11, 2015, Terry Virts of NASA, comprising cosmonaut Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos), and record setting Italian astronaut Samantha Cristoforetti from European Space Agency (ESA). Credit: NASA

June 10, 2015December 23, 2015 by Bob King

Ceres Bright Spots Keep Their Secret Even From 2,700 miles Up

The brightest spots on dwarf planet Ceres are seen in this image taken by NASA's Dawn spacecraft on June 6, 2015. This is among the first snapshots from Dawn's second mapping orbit, which is 2,700 miles (4,400 kilometers) in altitude. The resolution is 1,400 feet (410 meters) per pixel. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Don’t get me wrong. I love this new photo. Dawn snapped it from its second mapping orbit from 2,700 miles up on June 6. The number of craters and the detail visible in the parallel troughs snaking through the scene are breathtaking. That’s why I hate to niggle about the white spots.

While they appear larger and sharper than images taken in May from a greater distance, they’re too bright to show much new detail. I can’t help but wonder if mission scientists might adjust the exposure a bit the next time around.

Tighter crop on the 55-mile crater that's home to the cluster of white spots. Credit: — Tighter crop on the 55-mile (90-km) crater that’s home to the cluster of white spots. I applied a small amount of sharpening and toned down the spots just a little. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

When photographing bright objects here on Earth, we expose “for the highlights” or the bright areas in photos to avoid overexposure and loss of detail.

What a satisfying view! NASA/JPL-Caltech/UCLA/MPS/DLR/IDA — What a satisfying view! This image, also taken on June 6, shows a large crater in Ceres’ southern hemisphere as well as cracks and radial fractures possibly associated with impacts. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Naturally, when you try to capture details in something bright, your background will go dark. But that might be what’s needed here – a change in exposure to reveal more detail in the spots at the expense of the landscape. Doubtless NASA will release enlarged and detailed images of these enigmatic dots later this summer. Just call me impatient.

Scientists still don’t understand the nature of the spot cluster, but reflective ice or salt remain the strongest possibilities.

What is this - the Moon? A view of craters in Ceres' northern hemisphere from June 6, 2015. Credit: Bright Spots Shine in Newest Dawn Ceres Images VIR Image of Ceres, May 2015Bright Spots in Ceres' Second Mapping OrbitCeres' Southern Hemisphere in Survey Ceres' Northern Hemisphere in Survey Craters in the northern hemisphere of dwarf planet Ceres are seen in this image taken by NASA's Dawn spacecraft on June 6, 2015. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA — A lunar-like landscape in Ceres’ northern hemisphere photographed on June 6, 2015. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

“The bright spots in this configuration make Ceres unique from anything we’ve seen before in the solar system,” said Chris Russell, principal investigator for the Dawn mission. “The science team is working to understand their source. Reflection from ice is the leading candidate in my mind, but the team continues to consider alternate possibilities, such as salt.”

Images from Dawn's visible and infrared mapping spectrometer (VIR) show a portion of Ceres' cratered northern hemisphere, taken on May 16, 2015. From top to bottom, the views include a black-and-white image, a true-color view and a temperature image. The true-color view contains reddish dots that are image artifacts, which are not part of Ceres' surface. — Images from Dawn’s visible and infrared mapping spectrometer (VIR) show a portion of Ceres’ cratered northern hemisphere, taken on May 16, 2015 from 4,500 miles (7,300 km) away. From top to bottom, the views include a black-and-white image, a true-color view and a temperature image. In the bottom infrared view, the lightest areas are hottest and darkest are the coolest. Credit: NASA/JPL-Caltech/UCLA/ASI/INAF

It’s interesting to compare and contrast Ceres with Dawn’s first target asteroid, Vesta. Craters of every size dominate both small worlds, but Ceres shows evidence of a more activity in the form of relaxed crater rims (possibly due to ice deformation), landslides and collapsed structures.

Dawn takes about three days to orbit at its current 2,700 mile altitude. It will continue to take photos and make science observations until dropping into a new lower altitude of 900 miles (1, 450 km) in early August.

June 9, 2015December 23, 2015 by Ken Kremer

Longest Woman Spaceflyer to Return as Russia Reshuffles Station Launches After Rocket Failure

The longest space mission in history by a female astronaut is now set to conclude on Thursday, following Russia’s confirmation of a significant reshuffling of the crew and cargo flight manifest to the International Space Station (ISS) for the remainder of 2015 – all in the wake of the unexpected Russian launch failure of a station bound Progress resupply ship in late April with far reaching consequences.

The record setting flight of approximately 200 days by Italian spaceflyer Samantha Cristoforetti, along with her two Expedition 43 crewmates, will come to an end on Thursday, June 11, when the trio are set to undock and depart the station aboard their Russian Soyuz crew capsule and return back to Earth a few hours later.

NASA TV coverage begins at 6 a.m. EDT on June 11.

Roscosmos, the Russian Federal Space Agency, officially announced today, June 9, a revamped schedule changing the launch dates of several upcoming crewed launches this year to the Earth orbiting outpost.

Launch dates for the next three Progress cargo flights have also been adjusted.

The next three person ISS crew will now launch between July 23 to 25 on the Soyuz TMA-17M capsule from the Baikonur cosmodrome in Kazakhstan. The exact timing of the Expedition 44 launch using a Russian Soyuz-FG booster is yet to be determined.

Soon after the Progress mishap, the Expedition 43 mission was extended by about a month so as to minimize the period when the ISS is staffed by only a reduced crew of three people aboard – since the blastoff of the next crew was simultaneously delayed by Roscosmos by about two months from May to late July.

Indeed Cristoforetti’s endurance record only came about as a result of the very late mission extension ordered by Roscosmos, so the agency could investigate the root cause of the recent launch failure of the Russian Progress 59 freighter that spun wildly out of control soon after blastoff on April 28 on a Soyuz-2.1A carrier rocket.

Roscosmos determined that the Progress failure was caused by an “abnormal separation of the 3rd stage and the cargo vehicle” along with “associated frequency dynamic characteristics.”

The Expedition 43 crew comprising of Cristoforetti, NASA astronaut and current station commander Terry Virts, and Russian cosmonaut Anton Shkaplerov had been scheduled to head back home around May 13. The trio have been working and living aboard the complex since November 2014.

The 38-year old Cristoforetti actually broke the current space flight endurance record for a female astronaut during this past weekend on Saturday, June 6, when she eclipsed the record of 194 days, 18 hours and 2 minutes established by NASA astronaut Sunita Williams on a prior station flight back in 2007.

Cristoforetti, of the European Space Agency (ESA), also counts as Italy’s first female astronaut.

The Progress 59 cargo vessel, also known as Progress M-27M, along with all its 2.5 tons of contents were destroyed during an uncontrolled plummet back to Earth on May 8.

NASA astronaut Terry Virts (left) Commander of Expedition 43 on the International Space Station along with crewmates Russian cosmonaut Anton Shkaplerov (center) and ESA (European Space Agency) astronaut Samantha Cristoforetti on May 6, 2015 perform a checkout of their Russian Soyuz spacesuits in preparation for the journey back to Earth - now set for June 11, 2015. Credits: NASA — NASA astronaut Terry Virts (left) Commander of Expedition 43 on the International Space Station along with crewmates Russian cosmonaut Anton Shkaplerov (center) and ESA (European Space Agency) astronaut Samantha Cristoforetti on May 6, 2015 perform a checkout of their Russian Soyuz spacesuits in preparation for the journey back to Earth – now set for June 11, 2015. Credits: NASA

Roscosmos announced that they are accelerating the planned launch of the next planned Progress 60 (or M-28M) from August 6 up to July 3 on a Soyuz-U carrier rocket, which is different from the problematic Soyuz-2.1A rocket.

Following the Soyuz crew launch in late July, the next Soyuz will blastoff on Sept. 1 for a 10 day taxi mission on the TMA-18M capsule with cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen. After British opera singer Sarah Brightman withdrew from participating as a space tourist, a new third crew member will be named soon by Roscosmos.

The final crewed Soyuz of 2015 with the TMA-19M capsule has been postponed from Nov. 20 to Dec. 15.

Also in the mix is the launch of NASA’s next contracted unmanned Dragon cargo mission by commercial provider SpaceX on the CRS-7 flight. Dragon CRS-7 is now slated for liftoff on June 26. Watch for my onsite reports from KSC.

The most recent unmanned Dragon cargo CRS-6 mission concluded with a Pacific Ocean splashdown on May 21.

The Dragon will be carrying critical US equipment, known as the IDA, enabling docking by the SpaceX Crew Dragon and Boeing CST-100 astronaut transporters – due for first crewed launches in 2017.

ESA (European Space Agency) astronaut Samantha Cristoforetti enjoys a drink from the new ISSpresso machine. The espresso device allows crews to make tea, coffee, broth, or other hot beverages they might enjoy. Credit: NASA

NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko and Gennady Padalka will remain aboard the station after the Virts crew returns to begin Expedition 44.

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

June 8, 2015December 23, 2015 by Ken Kremer

Dawn Does Dramatic Fly Over of Ceres, Enters Lower Mapping Orbit: Video

This image of Ceres was taken by NASA's Dawn spacecraft on May 7, 2015, from a distance of 8,400 miles (13,600 kilometers). Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Video caption: This new video animation of Ceres was created from images taken by NASA’s Dawn spacecraft at altitudes of 8,400 miles (13,600 kilometers) and 3,200 miles (5,100 kilometers) away. Vertical dimension has been exaggerated by a factor of two and a star field added. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Scientists leading NASA’s Dawn mission to dwarf planet Ceres have just released a brand new animated video showing a dramatic fly over of the heavily cratered world featuring its mysterious bright spots whose exact origin and nature remain elusive.

Meanwhile, the venerable probe has just successfully entered its new and lower mapping orbit on June 3 from which researchers hope to glean hordes of new data to unravel the secrets of the bright spots and unlock the nature of Ceres origin and evolution.

Pockmarked Ceres is an alien world unlike any other in our solar system.

“Dawn completed the maneuvering to reach its second mapping orbit and stopped ion-thrusting on schedule. Since May 9, the spacecraft has reduced its orbital altitude from 8,400 miles (13,600 kilometers) to 2,700 miles (4,400 kilometers),” reported Marc Rayman, Dawn Chief Engineer/ Mission Director of NASA’s Jet Propulsion Laboratory, Pasadena, California.

“As Dawn flew 2,700 miles (4,400 kilometers) over Ceres’ north pole on June 5 that marked the beginning of the new mapping phase, and Dawn began taking photos and making other measurements on schedule.”

Each orbit of Dawn around Ceres at this second science mapping orbit lasts 3.1 days.

The new video was created by the research team based on observations of Ceres that were taken from Dawn’s initial mapping orbit, at an altitude of 8,400 miles (13,600 kilometers), as well as the most recent navigational images taken from 3,200 miles (5,100 kilometers), according to NASA.

It is based on data from over 80 images captured by Dawn’s framing cameras which were provided The German Aerospace Center (DLR) and Max Planck Institute for Solar System Research in Göttingen, Germany.

The images were used to provide a three-dimensional video view. The vertical dimension is exaggerated by a factor of two in the video.

“We used a three-dimensional terrain model that we had produced based on the images acquired so far,” said Dawn team member Ralf Jaumann of the German Aerospace Center (DLR), in Berlin.

“They will become increasingly detailed as the mission progresses — with each additional orbit bringing us closer to the surface.”

Imagery of the mysterious bright spots show them to seemingly be sheets of many spots of water ice, and not just single huge patches. The famous duo of ice spots are located inside the middle of a 57 miles (92 kilometers) wide crater situated in Ceres northern hemisphere.

Dawn is an international science mission managed by NASA’s Jet Propulsion Laboratory, Pasadena, California. The trio of science instruments are from the US, Germany and Italy.

The framing camera was provided by the Max Planck Institute for Solar System Research, Göttingen, Germany and the German Aerospace Center (DLR).

This view of Ceres was taken by Dawn spacecraft on May 23 and shows finer detail becoming visible on the dwarf planet. The spacecraft snapped the image at a distance of 3,200 miles (5,100 kilometers) with a resolution of 1,600 feet (480 meters) per pixel. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Dawn will spend most if June at this second mapping orbit before firing up the ion engines and spiraling yet lower for a mission expected to last until at least June 2016.

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

Dawn’s spiral descent from its first mapping orbit (RC3) to its second (survey). The two mapping orbits are shown in green. The color of Dawn’s trajectory progresses through the spectrum from blue, when it began ion-thrusting on May 9, to red, when ion-thrusting concludes on June 3. The red dashed sections show where Dawn is coasting, mostly for telecommunications. The first two coast periods include OpNav 8 and 9. Image credit: NASA/JPL-Caltech

June 5, 2015December 23, 2015 by Ken Kremer

Dazzling Gallery From India’s MOM Mars Orbiter Camera

Spectacular 3D view of Arsia Mons, a huge volcano on Mars, taken by camera on India’s Mars Orbiter Mission (MOM). Credit: ISRO
Story updated with more details and imagery[/caption]

India’s first ever robotic explorer to the Red Planet, the Mars Orbiter Mission, more affectionately known as MOM, has captured an absolutely dazzling array of images of the fourth rock from the Sun.

The Indian Space Research Organization (ISRO), India’s space agency, has recently published a beautiful gallery of images featuring a variety of picturesque Martian canyons, volcanoes, craters, moons and more.

We’ve gathered a collection here of MOM’s newest imagery snapped by the probes Mars Color Camera (MCC) for the enjoyment of Martian fans worldwide.

The spectacular 3D view of the Arsia Mons volcano, shown above, was “created by draping the MCC image on topography of the region derived from the Mars Orbiter Laser Altimeter (MOLA), one of five instruments on board NASA’s Mars Global Surveyor (MGS) spacecraft.

The Arsia Mons image was taken from Mars orbit on 1 April 2015 at a spatial resolution of 556 meters from an altitude of 10707 km. Volcanic deposits can be seen located at the flanks of the Mons, according to ISRO.

The view of Pital crater below was released in late May and taken on 23 April 2015. Pital is a 40 km wide impact crater located in the Ophir Planum region of Mars and the image shows a chain of small impact craters. It is located in the eastern part of Valles Marineris region, says an ISRO description. MCC took the image from an altitude of 808 km.

Pital crater is an impact crater located in Ophir Planum region of Mars, which is located in the eastern part of Valles Marineris region. This image is taken by Mars Color Camera (MCC) on 23-04-2015 at a spatial resolution of ~42 m from an altitude of 808 km. Credit: ISRO

It is an odd shaped crater, neither circular nor elliptical in shape, possibly due to “regional fracture in the W-E trending fracture zone.”

A trio of images, including one in stunning 3D, shows various portions of Valles Marineris, the largest known canyon in the Solar System.

Three dimensional view of Valles Marineris center portion from India’s MOM Mars Mission. Credit: ISRO

Valles Marineris stretches over 4,000 km (2,500 mi) across the Red Planet , is as much as 600 km wide and measures as much as 7 kilometers (4 mi) deep.

Valles Marineris from India’s Mars Mission. Credit: ISRO

For context here’s a previously taken global image of the red planet from MOM showing Valles Marinaris and Arsia Mons, which belongs to the Tharsis Bulge trio of shield volcanoes. They are both near the Martian equator.

Olympus Mons, Tharsis Bulge trio of volcanoes and Valles Marineris from ISRO's Mars Orbiter Mission. Note the clouds and south polar ice cap. Credit: ISRO — Olympus Mons, Tharsis Bulge trio of volcanoes and Valles Marineris from ISRO’s Mars Orbiter Mission. Note the clouds and south polar ice cap. Credit: ISRO

Valles Marineris is often called the “Grand Canyon of Mars.” It spans about as wide as the entire United States.

A gorgeous view of Phobos, the largest of Mars’ two tiny moons, silhouetted against the surface is shown below.

Phobos, one of the two natural satellites of Mars silhouetted against the Martian surface. Credit: ISRO

MOM’s goal is to study Mars atmosphere, surface environments, morphology, and mineralogy with a 15 kg (33 lb) suite of five indigenously built science instruments. It is also sniffing for methane, a potential marker for biological activity.

MOM is India’s first deep space voyager to explore beyond the confines of her home planets influence and successfully arrived at the Red Planet after the “history creating” orbital insertion maneuver on Sept. 23/24, 2014 following a ten month journey from Earth.
MOM swoops around Mars in a highly elliptical orbit whose nearest point to the planet (periapsis) is at about 421 km and farthest point (apoapsis) at about 76,000 km, according to ISRO.

It takes MOM about 3.2 Earth days or 72 hours to orbit the Red Planet.

Higher resolution view of a portion of Valles Marineris canyon from India’s MOM Mars Mission. Credit: ISRO

MOM was launched on Nov. 5, 2013 from India’s spaceport at the Satish Dhawan Space Centre, Sriharikota, atop the nations indigenous four stage Polar Satellite Launch Vehicle (PSLV) which placed the probe into its initial Earth parking orbit.

The $73 million MOM mission was expected to last at least six months. In March, ISRO extended the mission duration for another six months since its healthy, the five science instruments are operating fine and it has sufficient fuel reserves.

And with a communications blackout between Mars and Earth imminent as a result of natures solar conjunction, it’s the perfect time to catch up on all things Martian.

Solar conjunctions occur periodically between Mars and Earth about every 26 months, when the two planets line up basically in a straight line geometry with the sun in between as the two planets travel in their sun-centered orbits.

Since Mars will be located behind the Sun for most of June, communications with all the Terran spacecraft at the planet is diminished to nonexistent.

“MOM faces a communication outage during June 8-25,” according to The Hindu.

Normal science operations resume thereafter.

“Fuel on the spacecraft is not an issue,” ISRO Satellite Centre Director M. Annadurai told The Hindu.

Image of Tyrrhenus Mons in Hesperia Planum region taken by Mars Color Camera (MCC) on 25-02-2015 at a spatial resolution of 166m from an altitude of 3192km. Tyrrhenus Mons is an ancient martian volcano and image shows its timeworn gullies and wind streaks. Credit: ISRO

Including MOM, Earth’s invasion fleet at the Red Planet numbers a total of seven spacecraft comprising five orbiters from NASA, ESA and ISRO as well as the sister pair of mobile surface rovers from NASA – Curiosity and Opportunity.

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

June 4, 2015December 23, 2015 by Ken Kremer

Rosetta Discovery of Surprise Molecular Breakup Mechanism in Comet Coma Alters Perceptions

This single frame Rosetta navigation camera image was taken from a distance of 77.8 km from the centre of Comet 67P/Churyumov-Gerasimenko on 22 March 2015. The image has a resolution of 6.6 m/pixel and measures 6 x 6 km. The image is cropped and processed to bring out the details of the comet’s activity. Credit: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

A NASA science instrument flying aboard the European Space Agency’s (ESA) Rosetta spacecraft has made a very surprising discovery – namely that the molecular breakup mechanism of “water and carbon dioxide molecules spewing from the comet’s surface” into the atmosphere of comet 67P/Churyumov-Gerasimenko is caused by “electrons close to the surface.”

The surprising results relating to the emission of the comet coma came from measurements gathered by the probes NASA funded Alice instrument and is causing scientists to completely rethink what we know about the wandering bodies, according to the instruments science team.

“The discovery we’re reporting is quite unexpected,” said Alan Stern, principal investigator for the Alice instrument at the Southwest Research Institute (SwRI) in Boulder, Colorado, in a statement.

“It shows us the value of going to comets to observe them up close, since this discovery simply could not have been made from Earth or Earth orbit with any existing or planned observatory. And, it is fundamentally transforming our knowledge of comets.”

A paper reporting the Alice findings has been accepted for publication by the journal Astronomy and Astrophysics, according to statements from NASA and ESA.

Alice is a spectrograph that focuses on sensing the far-ultraviolet wavelength band and is the first instrument of its kind to operate at a comet.

Until now it had been thought that photons from the sun were responsible for causing the molecular breakup, said the team.

The carbon dioxide and water are being released from the nucleus and the excitation breakup occurs barely half a mile above the comet’s nucleus.

“Analysis of the relative intensities of observed atomic emissions allowed the Alice science team to determine the instrument was directly observing the “parent” molecules of water and carbon dioxide that were being broken up by electrons in the immediate vicinity, about six-tenths of a mile (one kilometer) from the comet’s nucleus.”

The excitation mechanism is detailed in the graphic below.

Rosetta’s continued close study of Comet 67P/Churyumov-Gerasimenko has revealed an unexpected process at work close to the comet nucleus that causes the rapid breakup of water and carbon dioxide molecules. Credits: ESA/ATG medialab; ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

“The spatial variation of the emissions along the slit indicates that the excitation occurs within a few hundred meters of the surface and the gas and dust production are correlated,” according to the Astronomy and Astrophysics journal paper.

The data shows that the water and CO2 molecules break up via a two-step process.

“First, an ultraviolet photon from the Sun hits a water molecule in the comet’s coma and ionises it, knocking out an energetic electron. This electron then hits another water molecule in the coma, breaking it apart into two hydrogen atoms and one oxygen, and energising them in the process. These atoms then emit ultraviolet light that is detected at characteristic wavelengths by Alice.”

“Similarly, it is the impact of an electron with a carbon dioxide molecule that results in its break-up into atoms and the observed carbon emissions.”

After a decade long chase of over 6.4 billion kilometers (4 Billion miles), ESA’s Rosetta spacecraft arrived at the pockmarked Comet 67P/Churyumov-Gerasimenko on Aug. 6, 2014 for history’s first ever attempt to orbit a comet for long term study.

Since then, Rosetta deployed the Philae landing craft to accomplish history’s first ever touchdown on a comets nucleus. It has also orbited the comet for over 10 months of up close observation, coming at times to as close as 8 kilometers. It is equipped with a suite 11 instruments to analyze every facet of the comet’s nature and environment.

Comet 67P is still becoming more and more active as it orbits closer and closer to the sun over the next two months. The pair reach perihelion on August 13, 2015 at a distance of 186 million km from the Sun, between the orbits of Earth and Mars.

Alice works by examining light emitted from the comet to understand the chemistry of the comet’s atmosphere, or coma and determine the chemical composition with the far-ultraviolet spectrograph.

According to the measurements from Alice, the water and carbon dioxide in the comet’s atmospheric coma originate from plumes erupting from its surface.

“It is similar to those that the Hubble Space Telescope discovered on Jupiter’s moon Europa, with the exception that the electrons at the comet are produced by solar radiation, while the electrons at Europa come from Jupiter’s magnetosphere,” said Paul Feldman, an Alice co-investigator from the Johns Hopkins University in Baltimore, Maryland, in a statement.

Rosetta discovered an unexpected process at comet nucleus that causes the rapid breakup of water and carbon dioxide molecules. Jets of gas and dust are blasting from the active neck of comet 67P/Churyumov-Gerasimenko in this photo mosaic assembled from four images taken on 26 September 2014 by the European Space Agency’s Rosetta spacecraft at a distance of 26.3 kilometers (16 miles) from the center of the comet. Credit: ESA/Rosetta/NAVCAM/Marco Di Lorenzo/Ken Kremer/kenkremer.com

Other instruments aboard Rosetta including MIRO, ROSINA and VIRTIS, which study relative abundances of coma constituents, corroborate the Alice findings.

“These early results from Alice demonstrate how important it is to study a comet at different wavelengths and with different techniques, in order to probe various aspects of the comet environment,” says ESA’s Rosetta project scientist Matt Taylor, in a statement.

“We’re actively watching how the comet evolves as it moves closer to the Sun along its orbit towards perihelion in August, seeing how the plumes become more active due to solar heating, and studying the effects of the comet’s interaction with the solar wind.”

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer