February 10, 2017February 15, 2017 by Evan Gough

Time To Build A Venus Rover

The planet Venus, as imaged by the Magellan 10 mission. Credit: NASA/JPL — The planet Venus, as imaged by the Magellan 10 mission. The planet's inhospitable surface makes exploration extremely difficult. Credit: NASA/JPL

Venus is often described as being hell itself, because of its crushing pressure, acidic atmosphere, and extremely high temperatures. Dealing with any one of these is a significant challenge when it comes to exploring Venus. Dealing with all three is extremely daunting, as the Soviet Union discovered with their Venera landers.

Actually, dealing with the sulphuric rain is not too difficult, but the heat and the pressure on the surface of Venus are huge hurdles to exploring the planet. NASA has been working on the Venus problem, trying to develop electronics that can survive long enough to do useful science. And it looks like they’re making huge progress.

Scientists at the NASA Glenn Research Centre have demonstrated electronic circuitry that should help open up the surface of Venus to exploration.

The first color pictures taken of the surface of Venus by the Venera-13 space probe. Credit: NASA — The first color pictures taken of the surface of Venus by the Venera-13 space probe. The Venera 13 probe lasted only 127 minutes before succumbing to Venus’s extreme surface environment. Credit: NASA

“With further technology development, such electronics could drastically improve Venus lander designs and mission concepts, enabling the first long-duration missions to the surface of Venus,” said Phil Neudeck, lead electronics engineer for this work.

With our current technology, landers can only withstand surface conditions on Venus for a few hours. You can’t do much science in a few hours, especially when weighed against the mission cost. So increasing the survivability of a Venus lander is crucial.

With a temperature of 460 degrees Celsius (860 degrees Fahrenheit), Venus is almost twice as hot as most ovens. It’s hot enough to melt lead, in fact. Not only that, but the surface pressure on Venus is about 90 times greater than Earth’s, because the atmosphere is so dense.

To protect the electronics on previous Venus landers, they have been contained inside special vessels designed to withstand the pressure and temperature. But these vessels add a lot of mass to the mission, and make sending landers to Venus a very expensive proposition. So NASA’s work on robust electronics is super important when it comes to exploring Venus.

The team at the Glenn Research Centre has developed silicon carbide semiconductor integrated circuits (Si C IC) that are extremely robust. Two of the circuits were tested inside a special chamber designed to precisely reproduce the conditions on Venus. This chamber is called the Glenn Extreme Environments Rig (GEER.)

The GEER (Glenn Extreme Environments Rig) facility can recreate the conditions of any body in our Solar System. (No, not the Sun, obviously.) Image: NASA/Glenn Research Centre

GEER is a special chamber that can recreate the conditions on any body in our Solar System. It’s an 800 Litre (28 cubic foot) chamber that can simulate temperatures up to 500° C (932° F), and pressures from near-vacuum to over 90 times the surface pressure of Earth. GEER can also simulate exotic atmospheres with its precision gas-mixing capabilities. It can mix very specific quantities of gases down to parts per million accuracy. For these tests, that means the unit had to reproduce an accurate recipe of CO2, N2, SO2, HF, HCl, CO, OCS, H2S, and H2O, down to very tiny quantities. And the tests were a success.

“We demonstrated vastly longer electrical operation with chips directly exposed — no cooling and no protective chip packaging — to a high-fidelity physical and chemical reproduction of Venus’ surface atmosphere,” Neudeck said. “And both integrated circuits still worked after the end of the test.”

In fact, the two circuits not only functioned after the test was completed, but they withstood Venus-like conditions for 521 hours. That’s more than 100 times longer than previous demonstrations of electronics designed for Venus missions.

A before (top) and after (bottom) image of the electronics after being tested in Venus atmospheric conditions. Image: NASA

The circuits themselves were originally designed to operate in the extremely high temperatures inside aircraft engines. “This work not only enables the potential for new science in extended Venus surface and other planetary exploration, but it also has potentially significant impact for a range of Earth relevant applications, such as in aircraft engines to enable new capabilities, improve operations, and reduce emissions,” said Gary Hunter, principle investigator for Venus surface electronics development.”

The chips themselves were very simple. They weren’t prototypes of any specific electronics that would be equipped on a Venus lander. What these tests showed is that the new Silicon Carbide Integrated Circuits (Si C IC) can withstand the conditions on Venus.

A host of other challenges remains when it comes to the overall success of a Venus lander. All of the equipment that has to operate there, like sensors, drills, and atmospheric samplers, still has to survive the thermal expansion from exposure to extremely high temperature. Robust new designs will be required in many cases. But this successful test of electronics that can survive without bulky, heavy, protective enclosures is definitely a leap forward.

If you’re interested in what a Venus lander might look like, check out the Venus Sail Rover concept.

February 10, 2017February 11, 2017 by Bob King

This Is The Highest Resolution Image Of Europa We Have … For Now

This is the highest resolution image taken by Galileo at Europa — Jupiter’s 4th largest moon — until our next mission to the planet. It was obtained at an original image scale of 19 feet (6 meters) per pixel. The gray line down the middle resulted from missing data that was not transmitted by Galileo. Credit: NASA/JPL-Caltech

In the movie 2010: The Year We Make Contact, the sequel to Stanley’s Kubrick’s 2001: A Space Odyssey, black Monoliths multiply, converge and transform Jupiter into a new star. We next hear astronaut David Bowman’s disembodied voice with this message: “All these worlds are yours except Europa. Attempt no landing there.” The newborn sun warms Europa, transforming the icy landscape into a primeval jungle. At the end, a single Monolith appears in the swamp, waiting once again to direct the evolution of intelligent life forms.

Europa’s cracked, icy surface imaged by NASA’s Galileo spacecraft in 1998. Credit: NASA/JPL-Caltech/SETI Institute

Stay away from Europa? No way. It’s just too fascinating a place with its jigsaw-puzzle ice sheets, crisscross valleys, miles of ice on top and a warm, salty ocean below. The movie was prescient — if you’re going to search for life elsewhere in the solar system, Europa’s one of the best candidates.

While we’ve sent spacecraft to photograph and study the icy moon during orbital flybys, no lander has yet to touch the surface. That may change soon. In early 2016, in response to a congressional directive, NASA’s Planetary Science Division began a pre-Phase A study to assess the science value and engineering design of a future Europa lander mission. In June 2016, NASA convened a 21-member team of scientists for the Science Definition Team (SDT). The team put together set of science objectives and measurements for the mission concept and submitted the report to NASA on Feb. 7.

This artist’s rendering illustrates a conceptual design for a potential future mission to land a robotic probe on the surface of Jupiter’s moon Europa. The lander is shown with a sampling arm extended, having previously excavated a small area on the surface. The circular dish on top is a combo high-gain antenna and camera mast, with stereo imaging cameras mounted on the back of the antenna. Three vertical shapes located around the top center of the lander are attachment points for cables that would lower the rover from a sky crane, the planned landing system for this mission concept. Credits: NASA/JPL-Caltech

The report lists three science goals for the mission. The primary goal is to search for evidence of life on Europa. The other goals are to determine the habitability of Europa by directly analyzing material from the surface, and to characterize the surface and subsurface to support future robotic exploration of Europa and its ocean.

This image from NASA’s Galileo spacecraft show the intricate detail of Europa’s icy surface. The red staining occurs in areas where briny waters from below — possibly mixed with sulfur — reach the surface. Radiation from Jupiter bombards the material, causing it to redden. Gravitational flexing of the moon as it orbits Jupiter fractures the icy crust into a chaotic landscape of snaking valleys and ice sheets. It also warms the ocean beneath the crust, potentially making it habitable. Credit: NASA/JPL-Caltech

The evidence is quite strong that Europa, with a diameter of 1,945 miles — slightly smaller than Earth’s moon — has a global saltwater ocean beneath its icy crust. This ocean has at least twice as much water as Earth’s oceans. Two things make Europa’s ocean unique and give the moon a greater chance of supporting microbial life compared to say, Ganymede and Enceladus, which also hold water reservoirs beneath their crusts.

Astronomers hypothesize that chloride salts bubble up from the icy moon’s global liquid ocean and reach the frozen surface where they are bombarded with sulfur from volcanoes on Jupiter’s innermost large moon Io. Molecular signs of life may be transported where they could be detected by a spacecraft. In this illustration, we see Europa (foreground), Jupiter (right) and Io (middle). Credit: NASA/JPL-Caltech

One: the ocean is relatively close to the surface, just 10-15 miles below the moon’s icy shell. Radiation from Jupiter (high-speed electrons and protons) bombards ice, sulfur and salts on the surface to create compounds that could trickle down into warmer regions and used by living things for growth and metabolism.

Broken plates and blocks of water ice now frozen in place in Europa’s crust suggest they floated freely for a time. Credit: NASA/JPL-Caltech

Two: While recent discoveries have shown that many bodies in the solar system either have subsurface oceans now, or may have in the past, Europa is one of only two places where the ocean appears to be in contact with a rocky seafloor (the other being Saturn’s moon Enceladus). This rare circumstance makes Europa one of the highest priority targets in the search for present-day life beyond Earth.

On Earth, chemical interactions between life and lifeless rock in deep oceans and within the outer crust provide the energy needed to power and sustain microbial life. For all we know, deep sea volcanoes belch essential elements into the salty waters spawned by the constant flexing and heating of the moon as it orbits Jupiter every 85 hours.

This mosaic of images includes the most detailed view of the surface of Jupiter’s moon Europa obtained by NASA’s Galileo mission. This observation was taken with the sun relatively high in the sky, so most of the brightness variations are due to color differences in the surface material rather than shadows. Ridge tops, brightened by frost, contrast with darker valleys, perhaps due to small temperature variations allow frost to accumulate in slightly colder, higher-elevation locations. Credit: NASA/JPL-Caltech

The SDT was tasked with developing a life-detection strategy, a first for a NASA mission since the Mars Viking mission era more than four decades ago. The report makes recommendations on the number and type of science instruments that would be required to confirm if signs of life are present in samples collected from the icy moon’s surface.

The team also worked closely with engineers to design a system capable of landing on a surface about which very little is known. Given that Europa has no atmosphere, the team developed a concept that could deliver its science payload to the icy surface without the benefit of technologies like a heat shield or parachutes.

This artist’s rendering shows NASA’s Europa mission spacecraft, which is being developed for a launch sometime in the 2020s. The spacecraft would orbit around Jupiter in order to perform a detailed investigation of Europa before a follow-up landing mission. The probe could look for “biosignatures” or molecular signs of life, such as the byproducts of metabolism, transported from the moon’s ocean to its surface. Credit: NASA/JPL-Caltech

The concept lander is separate from the solar-powered Europa multiple flyby mission, now in development for launch in the early 2020s. The spacecraft will arrive at Jupiter after a multi-year journey, orbiting the gas giant every two weeks for a series of 45 close flybys of Europa. The multiple flyby mission will investigate Europa’s habitability by mapping its composition, determining the characteristics of the ocean and ice shell, and increasing our understanding of its geology. The mission also will lay the foundation for a future landing by performing detailed reconnaissance using its powerful cameras.

We can’t help but be excited by the prospects of life-seeking missions to Europa. Sometimes wonderful things come in small packages.

February 9, 2017February 9, 2017 by Ken Kremer

NASA Approves First Commercial Airlock for Space Station Science and SmallSat Deployment

Artists concept of first commercially funded airlock on the space station being developed by NanoRacks that will launch on a commercial resupply mission in 2019. It will be installed on the station’s Tranquility module. Credits: NanoRacks

In a significant move towards further expansion of the International Space Station’s (ISS) burgeoning research and commercial space economy capabilities, NASA has approved the development of the first privately developed airlock and is targeting blastoff to the orbiting lab complex in two years.

Plans call for the commercial airlock to be launched on a commercial cargo vessel and installed on the U.S. segment of the ISS in 2019.

It enhances the US capability to place equipment and payloads outside and should triple the number of small satellites like CubeSats able to be deployed.

The privately funded commercial airlock is being developed by Nanoracks in partnership with Boeing, which is the prime contractor for the space station.

The airlock will be installed on an open port on the Tranquility module – that already is home to the seven windowed domed Cupola observation deck and the commercial BEAM expandable module built by Bigelow Aerospace.

“We want to utilize the space station to expose the commercial sector to new and novel uses of space, ultimately creating a new economy in low-Earth orbit for scientific research, technology development and human and cargo transportation,” said Sam Scimemi, director, ISS Division at NASA Headquarters in Washington, in a statement.

“We hope this new airlock will allow a diverse community to experiment and develop opportunities in space for the commercial sector.”

The airlock will launch aboard one of NASA’s commercial cargo suppliers in 2019. But the agency has not specified which contractor. The candidates include the SpaceX cargo Dragon, an enhanced ATK Cygnus or potentially the yet to fly SNC Dream Chaser.

Boeing will supply the airlock’s Passive Common Berthing Mechanism (CBM) hardware to connect it to the Tranquility module.

The airlock will beef up the capability of transferring equipment, payloads and deployable satellites from inside the ISS to outside, significantly increasing the utilization of ISS, says Boeing.

“The International Space Station allows NASA to conduct cutting-edge research and technology demonstrations for the next giant leap in human exploration and supports an emerging space economy in low-Earth orbit. Deployment of CubeSats and other small satellite payloads from the orbiting laboratory by commercial customers and NASA has increased in recent years. To support demand, NASA has accepted a proposal from NanoRacks to develop the first commercially funded airlock on the space station,” says NASA.

“The installation of NanoRacks’ commercial airlock will help us keep up with demand,” said Boeing International Space Station program manager Mark Mulqueen. “This is a big step in facilitating commercial business on the ISS.”

Right now the US uses the airlock on the Japanese Experiment Module (JEM) to place payloads on the stations exterior as well as for small satellite deployments. But the demand is outstripping the JEM’s availability.

The Nanoracks airlock will be larger and more robust to take up the slack.

NASA has stipulated that the Center for the Advancement of Science in Space (CASIS), NASA’s manager of the U.S. National Laboratory on the space station, will be responsible for coordinating all payload deployments from the commercial airlock – NASA and non NASA.

“We are entering a new chapter in the space station program where the private sector is taking on more responsibilities. We see this as only the beginning and are delighted to team with our friends at Boeing,” said Jeffrey Manber, CEO of NanoRacks.

The NanoRacks commercial airlock could potentially launch to the ISS in the trunk of a SpaceX cargo Dragon. This Up close view shows the SpaceX Dragon CRS-9 resupply ship and solar panels sitting atop a Falcon 9 rocket at pad 40 prior to blastoff to the ISS on July 18, 2016 from Cape Canaveral Air Force Station, Florida. Credit: Ken Kremer/kenkremer.com

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

Ken Kremer

February 8, 2017February 15, 2017 by Matt Williams

Uber Brings In NASA Engineer To Build Flying Cars

Uber recently announced that NASA engineer Mark Moore will be spearheading its plans for an on-demand aviation service, known as Uber Elevate. Credit: Uber

Flying cars have become something of a hot ticket item of late. In the past few years, companies like Terrafugia, Aeromobil and Moller International have all grabbed headlines with their particular designs. And soon enough, international transportation giant Uber could be joining the ranks of those looking to turn a popular staple of science fiction into science fact.

In a move to expand their ride-sharing services to the skies, the company recently hired NASA aerospace engineer Mark D. Moore to spearhead Uber Elevate. For 30 years, Moore has worked for NASA, researching advanced aircraft and technologies and vertical take-off and landing (VTOL) applications. And in 2010, he published a white paper in which detailed a revolutionary new concept for electric flying cars.

In this paper – titled “NASA Puffin Electric Tailsitter VTOL Concept” – Moore presented an outline for equipping VTOL craft with electronic engines. The benefits of this, he claimed, include zero emissions, a high engine power to weight rating, high efficiency and very little noise or vibrations. On top of that, the technology is scalable, offering the same benefits regardless of size.

*Artist’s concept of the NASA X-57 “Maxwell” electronic aircraft. Credit: NASA*

This study was the product of Moore’s many years working with the Aeronautics Systems Analysis Branch of NASA’s Langley Research Center, where he specialized in the development of distributed electric propulsion. For the past five years, Moore was the Principle Investigator of the Scalable Convergent Electric Propulsion Technology and Operations Research (SCEPTOR) project, a NASA program to create the first manned Distributed Electric Propulsion aircraft.

Prior to this, Moore was also the Principle Investigator of the Leading Edge Asynchronous Propeller Technology/Hybrid-Electric Integrated Systems Testbed (LeapTECH/HEIST) project, a one-year program that developed and tested a electric propulsion wing that used 18 propellers to achieve flight. The fruits of these labors can be seen with the X-57 “Maxwell” (shown above), a convergent electronic propulsion plane that relies on 14 electric motors with uniquely-designed wings to improve efficiency and reduce noise.

Beyond pushing the envelope for advanced aviation and propulsion designs, Moore strongly believes that this technology – which combines the benefits of efficient and lightweight motors with improvements in battery technology and automation – is the solution to the problems of traffic congestion and urban pollution caused by too many automobiles.

Naturally, his white paper garnered a lot of attention, particularly from billionaire entrepreneurs who are at the forefront of technological development. As Bloomberg Businessweek reported in the summer of 2016, Google co-founder Larry Page created two startups (Zee Aero and Kitty Hawk) to develop the technology, apparently in response to reading Moore’s paper.

*Maps prepared by Uber to demonstrate the effectiveness of on-demand aviation vs traditional commutes. Credit: Uber*

In October of 2016, Uber Technologies Inc. followed suit and announced the creation of Uber Elevate, a subsidiary charged with developing the technology, and has since hired Moore to serve as Elevate’s director of engineering. Shortly after Elevate was announced, Uber released their own white paper – a 99-page document that outlined the company’s vision of what they called “on-demand aviation”. As it says in this paper:

“Just as skyscrapers allowed cities to use limited land more efficiently, urban air transportation will use three-dimensional airspace to alleviate transportation congestion on the ground. A network of small, electric aircraft that take off and land vertically (called VTOL aircraft for Vertical Take-off and Landing, and pronounced vee-tol), will enable rapid, reliable transportation between suburbs and cities and, ultimately, within cities.

Such a plan would not only rely on VTOL network to bypass the usual infrastructure of roads, railways, bridges and tunnels, but would also call for the repurposing of parts of the urban landscape. Basically, Uber’s plan calls for transforming the tops of parking garages, existing helipads, and unused land surrounding highway interchanges to create a network of “vertiports” and “versistops”, complete with charging stations for their vehicles.

Acquiring Moore was certainly a coup de grace, as the NASA engineer was just a year away from retirement. As a result, he will not be eligible for his pension and health benefits. However, the move appears to be motivated in part by Moore’s desire to see the development of the technology become a reality. And these days, it seems that the private sector – and not within federal agencies – is where this is most likely to happen.

As Moore told Universe Today via email:

“Uber’s well suited to lead this because they are the on-demand market leader, with 55 million active monthly users. They’ve solved the multi-modal last mile problem, with incredible access and availability that provides wait times in major urban areas of only 2 to 3 minutes.”

Naturally, one of the biggest questions is whether Uber’s vehicles will be piloted or automated. On the one hand, Uber has launched a series of pilot project to test self-driving cars in various cities across the US. And a little over a week ago (Jan. 31st, 2017), Uber announced that it will be partnering with Daimler to introduce the automaker’s self-driving cars to their network.

These moves are a strong indication that the company is looking to automate in the long-term. And as Moore indicated, there is likely to be a period of transition:

“There will be an evolution from professional human pilots to autonomy over time as the background automation proves itself reliable and not requiring intervention by the human pilot – just as Uber is doing now with autonomous cars on the ground (which is a much harder problem because of how cluttered the ground environment is.”

In addition to Google and Uber, multinational aerospace giant Airbus is also working on its own VTOL car project – known as Project Vahana. As the company announced in November of 2016, Vahana is being run by the company’s Silicon Valley arm (A³, or “a cubed”) with the aim of producing of self-piloted VTOL craft by the early 2020s.

And there’s Joby Aviation, another Silicon Valley-based company that specializes in airframe design and electric motors that is hoping to expand into the VTOL market. Clearly, there is no shortage of entrepreneurs looking to harness the dream of VTOL transportation.

Of course, there are those who would say that these VTOL concepts are not “flying cars” in the strictest sense. Whereas companies like Aeromobil, Terrafugia and Moller International are specializing in vehicles that can both drive on land and fly, Google Airbus and Uber are looking to create vehicles that are more akin to transportation drones or personal helicopters.

But the terminology behind this concept, which has deep roots in science-fiction, has never been entirely accurate. In the end, the term “flying car” has been used rather loosely to refer to vehicles that relied on aerial traffic networks to get people from point A to point B. And with multiple companies looking to make this old promise a reality, the promise of flying cars in the 21st century might finally come true!

Further Reading: Bloomberg, NASA, Uber

February 8, 2017February 15, 2017 by Evan Gough

31 Years After Disaster, Challenger Soccer Ball Finally Gets To Orbit

Astronaut Shane Kimbrough took this photo of the Challenger soccer ball floating in front of the ISS's cupola window to mark NASA's day of remembrance for the Challenger disaster. Image: NASA

The Challenger disaster is one of those things that’s etched into people’s memories. The launch and resulting explosion were broadcast live. Professional astronauts may have been prepared to accept their fate, but that doesn’t make it any less tragic.

There’ve been fitting tributes over the years, with people paying homage to the crew members who lost their lives. But a new tribute is remarkable for its simplicity. And this new tribute is all centred around a soccer ball.

Ellison Onizuka was one of the Challenger seven who perished on January 28, 1986, when the shuttle exploded 73 seconds into its flight. His daughter and other soccer players from Clear Lake High School, near NASA’s Johnson Space Center, gave Ellison a soccer ball to take into space with him. Almost unbelievably, the soccer ball was recovered among the wreckage after the crash.

Ellison Onizuka, one of the seven who perished in the Challenger accident, carried a soccer ball into space. The ball was given to him by his daughter and other soccer players at a local high school. Image: NASA

The soccer ball was returned to the high school, where it was on display for the past three decades, with its meaning fading into obscurity with each passing year. Eventually, the Principal of the high school, Karen Engle, learned about the significance of the soccer ball’s history.

Because of Clear Lake High School’s close proximity to the Johnson Space Center, another astronaut now has a son attending the same school. His name is Shane Kimbrough, and he offered to carry a memento from the high school into space. That’s when Principal Engle had the idea to send the soccer ball with Kimbrough on his mission to the International Space Station.

NASA astronaut Shane Kimbrough, who took the soccer ball into space. Image: NASA

The causes of the Challenger accident are well-known. An O-ring failed in the cold temperature, and pressurized burning gas escaped and eventually caused the failure of the external fuel tank. The resulting fiery explosion left no doubt about the fate of the people onboard the shuttle.

It’s poignant that the soccer ball got a second chance to make it into space, when the Challenger seven never will. This tribute is touching for its simplicity, and is somehow more powerful than other tributes made with fanfare and speeches.

It must be difficult for family members of the Challenger seven to see the photos and videos of the explosion. Maybe this simple image of a soccer ball floating in zero gravity will take the place of those other images.

The Challenger seven deserve to be remembered for their spirit and dedication, rather than for the explosion they died in.

These are the seven people who perished in the Challenger accident:

Ellison Onizuka
Francis R. Scobee
Michael J. Smith
Ronald McNair
Judith Resnik
Gregory Jarvis
Christa McAuliffe

February 7, 2017February 15, 2017 by Evan Gough

Cassini Images Of Enceladus Highlight Possible Cradle For Life

Saturn's moon Enceladus, in all its glory. Captured by the Cassini probe. Image: NASA/JPL-Caltech/Space Science Institute

During its long mission to Saturn, the Cassini spacecraft has given us image after spectacular image of Saturn, its rings, and Saturn’s moons. The images of Saturn’s moon Enceladus are of particular interest when it comes to the search for life.

At first glance, Enceladus appears similar to other icy moons in our Solar System. But Cassini has shown us that Enceladus could be a cradle for extra-terrestrial life.

Our search for life in the Solar System is centred on the presence of liquid water. Maybe we don’t know for sure if liquid H2O is required for life. But the Solar System is huge, and the effort required to explore it is immense. So starting our search for life with the search for liquid water is wise. And in the search for liquid water, Enceladus is a tantalizing target.

Cassini captured this image of Enceladus with Saturn’s rings. The vapor plumes are slightly visible at the south polar region (bottom of image). Image: NASA/JPL/Space Science Institute

Though Enceladus looks every bit like a frozen, lifeless world on its surface, it’s what lies beneath its frigid crust that is exciting. Enceladus appears to have a subsurface ocean, at least in it’s south polar region. And that ocean may be up to 10 km. deep.

Before we dive into that, (sorry), here are a few basic facts about Enceladus:

Enceladus is Saturn’s sixth largest moon
Enceladus is about 500 km in diameter (Earth’s Moon is 3,474 km in diameter)
Enceladus was discovered in 1789 by William Herschel
Enceladus is one of the most reflective objects in our Solar System, due to its icy surface

In 2005, Cassini first spied plumes of frozen water vapor erupting from the southern polar region. Called cryovolcanoes, subsequent study of them determined that they are the likely source of Saturn’s E Ring. The existence of these plumes led scientists to suspect that their source was a sub-surface ocean under Enceladus’ ice crust.

This close up image of Enceladus clearly shows multiple plumes erupting into space. Image: NASA/JPL/Space Science Institute

Finding plumes of water erupting from a moon is one thing, but it’s not just water. It’s salt water. Further study showed that the plumes also contained simple organic compounds. This advanced the idea that Enceladus could harbor life.

This image of Enceladus shows the features known as “Tiger stripes”. They are the source of the vapor plumes that erupt from the surface. Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

The geysers aren’t the only evidence for a sub-surface ocean on Enceladus. The southern polar region has a smooth surface, unlike the rest of the moon which is marked with craters. Something must have smoothed that surface, since it is next to impossible that the south polar region would be free from impact craters.

In 2005, Cassini detected a warm region in the south, much warmer than could be caused by solar radiation. The only conclusion is that Enceladus has a source of internal heating. That internal heat would create enough geologic activity to erase impact craters.

So now, two conditions for the existence of life have been met: liquid water, and heat.

In 2005, data from Cassini showed that the so-called “Tiger Stripe” features on Enceladus’ south pole region are warm spots. Image:NASA/JPL/GSFC/SwRI/SSI

The source of the heat on Enceladus was the next question facing scientists. That question is far from settled, and there could be several sources of heat operating together. Among all the possible sources for the heat, two are most intriguing when it comes to the search for life: tidal heating, and radioactive heating.

Tidal heating is a result of rotational and orbital forces. In Enceladus’ case, these forces cause friction which is dissipated as heat. This heat keeps the sub-surface ocean in liquid form, but doesn’t prevent the surface from freezing solid.

Radioactive heating is caused by the decay of radioactive isotopes. If Enceladus started out as a rocky body, and if it contained enough short-lived isotopes, then an enormous amount of heat would be produced for several million years. That action would create a rocky core surrounded by ice.

Then, if enough long-lived radioactive isotopes were present, they would continue producing heat for a much longer period of time. However, radioactive heating isn’t enough on its own. There would have to be tidal heating also.

Gravity measurements by NASA’s Cassini spacecraft and Deep Space Network suggest that Saturn’s moon Enceladus, which has jets of water vapor and ice gushing from its south pole, also harbors a large interior ocean beneath an ice shell, as this illustration depicts.
Image Credit:
NASA/JPL-Caltech

More evidence for a large, sub-surface ocean came in 2014. Cassini and the Deep Space Network provided gravitometric measurements showing that the ocean is there. Those measurements showed that there is likely a regional, if not global, ocean some 10 km thick. Measurements also showed that the ocean is under an ice layer 30 to 40 km thick.

This close up image of Enceladus show the variability of its icy features. The dark spots were originally called “Dalmatian” terrain when first imaged in 2005. There exact nature remained a mystery until ten years later, when Cassini flybys showed that they are actually blocks of bedrock ice scattered along a ridge. The blocks range in size from tens to hundreds of meters. Image: NASA/JPL/Cal-Tech.

The discovery of a warm, salty ocean containing organic molecules is very intriguing, and has expanded our idea of what the habitable zone might be in our Solar System, and in others. Enceladus is much too distant from the Sun to rely on solar energy to sustain life. If moons can provide their own heat through tidal heating or radioactive heating, then the habitable zone in any solar system wouldn’t be determined by proximity to the star or stars at the centre.

Cassini’s mission is nearing its end, and it won’t fly by Enceladus again. It’s told us all it can about Enceladus. It’s up to future missions to expand our understanding of Enceladus.

Numerous missions have been talked about, including two that suggest flying through the plumes and sampling them. One proposal has a sample of the plumes being returned to Earth for study. Landing on Enceladus and somehow drilling through the ice remains a far-off idea better left to science fiction, at least for now.

Whether or not Enceladus can or does harbor life is a question that won’t be answered for a long time. In fact, not all scientists agree that there is a liquid ocean there at all. But whether it does or doesn’t harbor life, Cassini has allowed us to enjoy the tantalizing beauty of that distant object.

Enceladus. Cassini Imaging Team, SSI, JPL, ESA, NASA

February 7, 2017February 8, 2017 by Ken Kremer

SpaceX Awaits FAA Falcon 9 Launch License for 1st Pad 39A Blastoff on NASA ISS Cargo Flight

SpaceX crews are renovating Launch Complex 39A at the Kennedy Space Center for launches of commercial and human rated Falcon 9 rockets as well as the Falcon Heavy, as seen here during Dec 2016 with construction of a dedicated new transporter/erector. New rocket processing hangar sits at left. Credit: Ken Kremer/kenkremer.com

KENNEDY SPACE CENTER, FL – With liftoff tentatively penciled in for mid-February, SpaceX still awaits FAA approval of a launch license for what will be the firms first Falcon 9 rocket to launch from historic pad 39A at the Kennedy Space Center – on a critical NASA mission to resupply the space station – the Federal Aviation Administration (FAA) confirmed today to Universe Today.

“The FAA is working closely with SpaceX to ensure the activity described in the application meets all applicable regulations for a launch license,” FAA spokesman Hank Price confirmed to Universe Today.

As of today, Feb. 7, SpaceX has not yet received “a license determination” from the FAA – as launch vehicle, launch pad and payload preparations continue moving forward for blastoff of the NASA contracted flight to carry science experiments and supplies to the International Space Station (ISS) aboard a SpaceX cargo Dragon atop an upgraded SpaceX Falcon 9 rocket from Launch Complex 39A on the Florida Space Coast.

“The FAA will continue to work with SpaceX to provide a license determination in a timely manner,” Price told me.

SpaceX currently has license applications pending with the FAA for both the NASA cargo launch and pad 39A. No commercial launch can take place without FAA approval.

Blastoff of SpaceX Falcon 9 on Dragon CRS-9 resupply mission to the International Space Station (ISS) at 12:45 a.m. EDT on July 18, 2016. Credit: Ken Kremer/kenkremer.com

The goal of the 22-story tall SpaceX Falcon 9 is to carry an unmanned Dragon cargo freighter for the NASA customer on the CRS-10 resupply mission to the International Space Station (ISS).

Dragon will be loaded with more than two tons of equipment, gear, food, supplies and NASA’s Stratospheric Aerosol Gas Experiment III (SAGE III) ozone mapping science payload.

Engineers at work processing NASA’s Stratospheric Aerosol and Gas Experiment III, or SAGE III instrument inside the Space Station Processing Facility at NASA’s Kennedy Space Center in Florida during exclusive visit by Ken Kremer/Universe Today in December 2016. Technicians are working in a super-clean ‘tent’ built in the SSPF high bay to protect SAGE III’s special optics and process the Ozone mapper for upcoming launch on the SpaceX CRS-10 Dragon cargo flight to the International Space Station in early 2017. Credit: Ken Kremer/kenkremer.com

The historic NASA launch pad was formerly used to launch both America’s space shuttles and astronauts on Apollo/Saturn V moon landing missions.

SpaceX, founded by billionaire CEO Elon Musk, leased Launch Complex 39A from NASA back in April 2014 and is modifying and modernizing the pad for unmanned and manned launches of the Falcon 9 as well as the Falcon Heavy.

The role of the FAA is to license commercial launches and protect the public.

“The FAA licenses commercial rocket launches and reentries to ensure the protection of public health and safety,” Price elaborated.

This FAA license situation is similar to that for last month’s Falcon 9 ‘Return to Flight’ launch from California, where the SpaceX approval was granted only days before liftoff of the Iridium-1 mission.

Last week SpaceX announced a shuffled launch schedule, whereby the NASA cargo flight on the CRS-10 resupply mission was placed first in line for liftoff from pad 39A – ahead of a commercial EchoStar communications satellite.

The aerospace company said the payload switch would allow additional time was to complete all the extensive ground support work and pad testing required for repurposing seaside Launch Complex 39A from launching the NASA Space Shuttle to the SpaceX Falcon 9.

The inaugural Falcon 9 blastoff from pad 39A has slipped repeatedly from January into February 2017.

The unofficial most recently targeted ‘No Earlier Than’ NET date for CRS-10 has apparently slipped from NET Feb 14 to Feb 17.

CRS-10 counts as SpaceX’s tenth cargo flight to the ISS since 2012 under contract to NASA.

Further launch postponements are quite possible at any time and NASA is officially stating a goal of “NET mid-February” – but with no actual target date specified.

SpaceX is repurposing historic pad 39A at the Kennedy Space Center, Florida for launches of the Falcon 9 rocket. Ongoing pad preparation by work crews is seen in this current view taken on Jan. 27, 2017. Credit: Ken Kremer/kenkremer.com

Crews have been working long hours to transform and refurbish pad 39A and get it ready for Falcon 9 launches. Furthermore, a newly built transporter erector launcher was seen raised at the pad multiple times in recent weeks. The transporter will move the rocket horizontally up the incline at the pad, and then erect it vertically for launch.

SpaceX was previously employing pad 40 on Cape Canaveral Air Force Station for Falcon 9 launches to the ISS as well as commercial launches.

But pad 40 suffered severe damage following the unexpected launch pad explosion on Sept 1, 2016 that completely destroyed a Falcon 9 and the $200 million Amos-6 commercial payload during a prelaunch fueling test.
Furthermore it is not known when pad 40 will be ready to resume launches.

Thus SpaceX has had to switch launch pads for near term future flights and press pad 39A into service much more urgently, and the refurbishing and repurposing work is not yet complete.

Pad 39A has lain dormant for launches for nearly six years since Space Shuttle Atlantis launched on the final shuttle mission STS 135 in July 2011.

To date SpaceX has not rolled a Falcon 9 rocket to pad 39A, not raised it to launch position, not conducted a fueling exercise and not conducted a static fire test. All the fit checks with a real rocket remain to be run.

Up close view of SpaceX Dragon CRS-9 resupply ship and solar panels atop Falcon 9 rocket at pad 40 prior to blastoff to ISS on July 18, 2016 from Cape Canaveral Air Force Station, Florida. Credit: Ken Kremer/kenkremer.com

Once the pad is ready, SpaceX plans an aggressive launch schedule in 2017.

“The launch vehicles, Dragon, and the EchoStar satellite are all healthy and prepared for launch,” SpaceX stated.

The history making first use of a recycled Falcon 9 carrying the SES-10 communications satellite could follow as soon as March or April, if all goes well – as outlined here.

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

Ken Kremer

February 5, 2017February 5, 2017 by Matt Williams

Juno Buzzes Jupiter a mere 4,300 Km’s above the Cloud Tops

Illustration of NASA's Juno spacecraft firing its main engine to slow down and go into orbit around Jupiter. Lockheed Martin built the Juno spacecraft for NASA's Jet Propulsion Laboratory. Credit: NASA/Lockheed Martin

On July 4th, 2016, NASA’s Juno spacecraft made history when it became the second mission to establish orbit around Jupiter – the previous being the Galileo spacecraft, which orbited the planet from 1995 to 2003. Since that time, it has circled the massive gas giant three times, collecting data on the gas giant’s composition, interior and gravity field.

This past Thursday, February 1st, the mission conducted its fourth orbit of the planet. In the process, the spacecraft collected more vital data on the gas giant and snapped several dozen pictures. And in what is has been a first for a space mission, NASA will once again be asking the public what features they would like to see photographed during Juno’s next pass.

Juno made its closest pass (what is known as perijove) to Jupiter at precisely 1257 GMT (7:57 a.m. EST), passing the cloud tops at a distance of 4,300 km (2,670 mi) and traveling at a velocity of about 208,000 km/h (129,300 mph) relative to the gas giant. Using its suite of instruments, it scanned Jupiter’s atmosphere, gathered data on its radiation and plasma, and began returning this information to Earth.

Processed image taken on Dec. 11, 2016, at 9:27 a.m. PST (12:27 p.m. EST) by the NASA Juno spacecraft, as it performed its third close flyby of Jupiter. Credits: NASA/JPL-Caltech/SwRI/MSSS/Eric Jorgensen

And during this latest pass, the JunoCam snapped several dozen more pictures. During two of its three previous perijove maneuvers, this instruments captured some of the most breathtaking photographs of Jupiter’s clouds to date (like the one seen above). Once they were transmitted back to Earth and made available to the public, “citizen scientists” were able to download and process them at their leisure.

And with this latest pass complete, the public is once again being encouraged to vote on what features they want to see photographed during the next pass. As Candy Hansen, the Juno mission’s co-investigator from the Planetary Science Institute, stated shortly before Juno made its fourth perijovian maneuver:

“The pictures JunoCam can take depict a narrow swath of territory the spacecraft flies over, so the points of interest imaged can provide a great amount of detail. They play a vital role in helping the Juno science team establish what is going on in Jupiter’s atmosphere at any moment. We are looking forward to seeing what people from outside the science team think is important.”

This has all been part of a first-ever effort on behalf of NASA to get the public involved in what kinds of images are to be taken. According to NASA, this is to become a regular feature of the Juno mission, with a new voting page being created for each upcoming flyby. The next perijovian maneuver will take place on March 27th, 2017, coinciding with the Juno spacecraft’s 53.4-day orbital period.

*False color view of Jupiter’s polar haze, created by citizen scientist Gerald Eichstädt using data from the JunoCam instrument. Credit: NASA/JPL-Caltech/SwRI/MSSS/Eric Jorgensen*

Originally, the mission planners had hoped to narrow Juno’s orbital period down to 14 days, which would have been accomplished by having the craft fire its main engine while at perijove. However, two weeks before the engine burn was scheduled to take place (Oct. 19th, 2016), ground controllers noticed a problem with two of the engine’s check valves – which are part of the spacecraft’s fuel pressurization system.

As Juno project manager Rick Nybakken said at the time:

“Telemetry indicates that two helium check valves that play an important role in the firing of the spacecraft’s main engine did not operate as expected during a command sequence that was initiated yesterday. The valves should have opened in a few seconds, but it took several minutes. We need to better understand this issue before moving forward with a burn of the main engine.”

Because of this technical issue, the mission leaders chose to postpone the engine burn so they could check the craft’s instruments to get a better understanding of why it happened. The Juno team was hoping to use the third orbit of the spacecraft to study the problem, but this was interrupted when a software performance monitor induced a reboot of the spacecraft’s onboard computer.

To accomplish its science objectives, Juno is orbiting Jupiter’s poles and passing very close to the planet, avoiding the most powerful (and hazardous) radiation belts in the process. Credit: NASA/JPL-Caltech

Because of this, the spacecraft went into safe mode during its third flyby, which prevented them from gathering data on the engine valve problem. On Oct. 24th, the mission controllers managed to get the craft to exit safe mode and performed a trim maneuver in preparation for its next flyby. But the mystery of why the engine valves failed to open remains, and the mission team is still unable to resolve the problem.

Thus, the decision to fire the main engine (thereby shortening its orbital period) has been postponed until they get it back online. But as Scott Bolton – the Associate Director of R&D at the Southwest Research Institute (SwRI) and Juno’s Principal Investigator – has emphasized in the past:

“It is important to note that the orbital period does not affect the quality of the science that takes place during one of Juno’s close flybys of Jupiter. The mission is very flexible that way. The data we collected during our first flyby on August 27th was a revelation, and I fully anticipate a similar result from Juno’s October 19th flyby.”

In the meantime, the Juno science team is still analyzing data from all previous Jupiter flybys. During each pass, the spacecraft and its instruments peer beneath Jupiter’s dense cloud cover to study its auroras, its magnetic field, and to learn more about the planet’s structure, composition, and formation. And with the public’s help, it is also providing some of the clearest and most detailed imagery of the gas giant to date.

Further Reading: NASA

February 4, 2017February 6, 2017 by Ken Kremer

Used SpaceX Booster Set for Historic 1st Reflight is Test Fired in Texas

SpaceX Falcon 9 first stage previously flown to space is test fired at the firms McGregor, TX rocket development facility in late January 2017 to prepare for relaunch. Credit: SpaceX

The first orbit class SpaceX rocket that will ever be reflown to launch a second payload to space was successfully test fired by SpaceX engineers at the firms Texas test facility last week.

The once fanciful dream of rocket recycling is now closer than ever to becoming reality, after successful completion of the static fire test on a test stand in McGregor, Texas, paved the path to relaunch, SpaceX announced via twitter.

The history making first ever reuse mission of a previously flown liquid fueled Falcon 9 first stage booster equipped with 9 Merlin 1D engines could blastoff as soon as March 2017 from the Florida Space Coast with the SES-10 telecommunications satellite, if all goes well.

The booster to be recycled was initially launched in April 2016 for NASA on the CRS-8 resupply mission under contract for the space agency.

“Prepping to fly again — recovered CRS-8 first stage completed a static fire test at our McGregor, TX rocket development facility last week,” SpaceX reported.

The CRS-8 Falcon 9 first stage booster successfully delivered a SpaceX cargo Dragon to the International Space Station (ISS) in April 2016.

The Falcon 9 first stage was recovered about 8 minutes after liftoff via a propulsive soft landing on an ocean going droneship in the Atlantic Ocean some 400 miles (600 km) off the US East coast.

First launch of flight-proven Falcon 9 first stage will use CRS-8 booster that delivered Dragon to the International Space Station in April 2016. Credit: SpaceX

SpaceX, founded by billionaire and CEO Elon Musk, inked a deal in August 2016 with telecommunications giant SES, to refly a ‘Flight-Proven’ Falcon 9 booster.

Luxembourg-based SES and Hawthrone, CA-based SpaceX jointly announced the agreement to “launch SES-10 on a flight-proven Falcon 9 orbital rocket booster.”

Exactly how much money SES will save by utilizing a recycled rocket is not known. But SpaceX officials have been quoted as saying the savings could be between 10 to 30 percent.

The SES-10 launch on a recycled Falcon 9 booster was originally targeted to take place before the end of 2016.

That was the plan until another Falcon 9 exploded unexpectedly on the ground at SpaceX’s Florida launch pad 40 during a routine prelaunch static fire test on Sept. 1 that completed destroyed the rocket and its $200 million Amos-6 commercial payload on Cape Canaveral Air Force Station.

The Sept. 1 launch pad disaster heavily damaged the SpaceX pad and launch infrastructure facilities at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida.

Aerial view of pad and strongback damage at SpaceX Launch Complex-40 as seen from the VAB roof on Sept. 8, 2016 after fueling test explosion destroyed the Falcon 9 rocket and AMOS-6 payload at Cape Canaveral Air Force Station, FL on Sept. 1, 2016. Credit: Ken Kremer/kenkremer.com

Pad 40 is still out of commission as a result of the catastrophe. Few details about the pad damage and repair work have been released by SpaceX and it is not known when pad 40 will again be certified to resume launch operations.

Therefore SpaceX ramped up preparations to launch Falcon 9’s from the firms other pad on the Florida Space Coast – namely historic Launch Complex 39A which the company leased from NASA in 2014.

Pad 39A is being repurposed by SpaceX to launch the Falcon 9 and Falcon Heavy rockets. It was previously used by NASA for more than four decades to launch Space Shuttles and Apollo moon rockets.

But SES-10 is currently third in line to launch atop a Falcon 9 from pad 39A.

The historic first launch of a Falcon 9 from pad 39A is currently slated for no earlier than Feb. 14 on the CRS-10 resupply mission for NASA to the ISS – as reported here.

The EchoStar 23 comsat is slated to launch next, currently no earlier than Feb 28.

SES-10 will follow – if both flights go well.

SpaceX successfully launched SES-9 for SES in March 2016.

Sunset blastoff of SpaceX Falcon 9 carrying SES-9 communications satellite from Space Launch Complex 40 on Cape Canaveral Air Force Station, FL. Credit: Ken Kremer/kenkremer.com

Last July, SpaceX engineers conducted a test firing of another recovered booster as part of series of test examining long life endurance testing. It involved igniting all nine used first stage Merlin 1D engines housed at the base of a used landed rocket.

The Falcon 9 first stage generates over 1.71 million pounds of thrust when all nine Merlin engines fire up on the test stand for a duration of up to three minutes – the same as for an actual launch.

Watch the engine test in this SpaceX video:

Video Caption: Falcon 9 first stage from May 2016 JCSAT mission was test fired, full duration, at SpaceX’s McGregor, Texas rocket development facility on July 28, 2016. Credit: SpaceX

SES-10 satellite mission artwork. Credit: SES

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

Ken Kremer

SpaceX Falcon 9 booster moving along the Port Canaveral channel atop droneship platform with cruise ship in background nears ground docking facility on June 2, 2016 following Thaicom-8 launch on May 27, 2016. Credit: Ken Kremer/kenkremer.com

February 1, 2017February 15, 2017 by Evan Gough

Preleminary Results In NASA Twins Study Released

NASA's astronauts twins, Scott Kelly (l) and Mark Kelly (r). Image: NASA — NASA's astronaut twins, Scott Kelly (l) and Mark Kelly (r). Image: NASA

In 1996, something remarkable happened at NASA. Twin brothers Mark and Scott Kelly were accepted into NASA; Mark as a shuttle pilot, and Scott into technical operations on the ground, at least initially. Eventually, both brothers became astronauts. They are the only siblings to have both been in space.

Whether it was intentional or not, having twin brothers gave NASA an important opportunity. They could use one twin as a control group, and send the other on a prolonged mission into space. That allowed NASA to carry out important research on the effects of space travel on the human body.

In March 2016, Scott Kelly returned from a year long (340 days) mission aboard the International Space Station, while his brother Mark stayed on Earth. Genetic samples were taken from each brother before and after Scott’s time aboard the ISS. Now, NASA has released the preliminary results of this unprecedented opportunity.

Expedition 46 Commander Scott Kelly of NASA is seen after returning to Ellington Field, Thursday, March 3, 2016 in Houston, Texas after his return to Earth the previous day. Kelly and Flight Engineers Mikhail Kornienko and Sergey Volkov of Roscosmos landed in their Soyuz TMA-18M capsule in Kazakhstan on March 1 (Eastern time).

NASA’s Human Research Program did the study, and the results were released at their Investigator’s Workshop on the week of January 23rd. The theme of that workshop was A New Dawn: Enabling Human Space Exploration. Though the studies are on-going, these initial results are interesting.

Omics

Mike Snyder, who is the Integrated Omics investigator, reported his findings. He found an altered level of lipids in Scott, the flight twin, which indicates inflammation. He also found increased 3-indolepropionic (IPA) in Mark, the ground twin. IPA is a potential brain antioxidant therapeutic, and also helps maintain normal insulin levels, to stabilize blood sugar after meals.

Telomeres and Telomerase

Telomeres and Telomerase are part of the chromosomal system in the human body. Susan Bailey reported that for Scott, the flight twin, the length of his white blood cell’s telomeres increased while in space. Typically, they decrease as a person ages. Once on Earth, they began to shorten again.

Telomerase, an enzyme that repairs telomeres, increased in both brothers in November, which could be related to a stressful family event at that time.

The Soyuz TMA-18M spacecraft is seen as it lands with Expedition 46 Commander Scott Kelly of NASA and Russian cosmonauts Mikhail Kornienko and Sergey Volkov in Kazakhstan on Wednesday, March 2, 2016. Photo Credit: (NASA/Bill Ingalls)

Cognitive Performance in Spaceflight

Mathias Basner is studying Cognitive Performance in Spaceflight, especially the difference in cognition between a 12-month mission and a six-month mission. Though he found a slight decrease in speed and accuracy after the mission, he found no real difference in cognition between 6 month and 12 month missions.

Biochemistry

Scott Smith’s investigation into biochemistry showed a decrease in bone density during the second half of Scott’s mission. Scott also had increased levels of a biochemical marker for inflammation once he returned to Earth.

Microbiome in the Gastro-Intestinal Tract

Fred Turek reported preliminary results of his investigation into the bacteria in the GI (microbiome) tract that help digestion. There were many differences in the twins’ biomes, but that was expected because of their different diets and environments. There were interesting differences in Scott’s biome between his time in space and his time on the ground. The ratio between two dominant bacterial groups shifted during his flight time compared to his ground time.

Immunome Studies

Emmanuel Mignot investigated changes in the bodies of both twins before and after a flu vaccine was given. Both twins showed increased levels of T-cell receptors after the vaccine, which was the expected immune response.

Genome Sequencing

Chris Mason is performing Genome Sequencing on the DNA and RNA contained within the twins’ white blood cells with his investigation. RNA sequencing showed that over 200,000 RNA molecules were expressed differently between the twins. Mason will look closer to see if a “space gene” could have been activated while Scott was in space.

Epigenomics

Andy Feinberg studies how the environment regulates our gene expression, which is known as epigenomics. Scott’s white blood cell DNA showed decreased levels of chemical modification while in flight, and a return to normal once back on Earth. The same level in Mark (the ground twin) increased midway through the study, but then returned to normal. There was variability between the twins, called epigenetic noise. This noise was higher in Scott during his spaceflight, and returned to baseline levels once back on Earth. This could indicate that some genes are more sensitive to the changing environment of spaceflight than others.

There’s a lot more research required to truly understand these results. Once they’re looked at in coordination with other physiological, psychological, and technological investigations, the picture will become clearer. Later in 2017, there will be a joint publication of further results, as well as individual research papers.

NASA’s goal is to make space travel safer for astronauts, and to make missions more effective and efficient. With all the talk of missions to Mars in the next decade, these results are arriving at the perfect time.