Universe Today

April 6, 2017April 28, 2017 by Matt Williams

What Are You Doing For Yuri’s Night?

On April 12th, 1961, history was made when the first human being – Russian cosmonaut Yuri Gagarin – went into space. Similarly, on April 12th, 1981, the inaugural launch of the Space Shuttle took place. In recognition of these accomplishments, people from all around the world have been celebrating “Yuri’s Night” – a global festival honoring humanity’s past, present, and future in space – for over a decade and a half.

This year will mark the 56th anniversary of Yuri Gagarin’s historic flight and of human spaceflight in general. As with every Yuri’s Night that has happened since 2001, this year’s festivities will feature educational events, presentations and games (along with general revelry) at venues located all across the world. Do you have any plans for Yuri’s Night 2017? And if not, perhaps you would like to know what’s happening?

Plenty of events have been planned for this year that are sure to appeal to science enthusiasts and those with a passion for space exploration. One of the highlights for 2017 is a chance to enjoy a virtual reality space vacation, which comes courtesy of the fun folks at Guerilla Science – a London and New York-based group that specializing in creating educational events and installations for festivals, museums, galleries, etc.

*Screen shot from Guerilla Science’s “space vacation” VR app. Click to see the animation. Credit: guerillascience.org*

For the sake of this year’s Yuri’s night, they are offering people a chance to experience a VR application that allows people to experience a trip to Mars’ Mariner Valley, or to take a self-guided tour on the Moon using the clicker to navigate. To learn more about this application (which is also available for beta testing), be sure to check out Guerilla Science’s “Intergalactic Travel Bureau“. As they describe the bureau’s purpose on their website:

“The Intergalactic Travel Bureau is a live, interactive experience that explores the incredible possibilities of space tourism through personalized space vacation planning experiences. It’s a little bit like Virgin Galactic and SpaceX meet the Jetsons and Mad Men. Bringing together space scientists, astronomers, science educators, actors and the general public, the Bureau has popped up all over the UK and the US since 2011.”

In addition, a virtual event is being hosted by Spacelog, a volunteer organization dedicated to sharing mission transcripts and photographs that celebrate the history of space exploration. In commemoration of Gagarin’s historic flight, they will be publishing the transcripts of the Vostok 1 mission on their Facebook page. Like the mission itself, the event will start at 4:10 am UTC and conclude at 07:55 UTC on Wednesday, April 12th.

For those interested, the Yuri’s Night Global Team (led by Veronica Ann Zabala-Aliberto) is still seeking Regional Team Leaders to help provide support, coordination, and resources for the hundreds of Yuri’s Night parties that have been planned. In addition to organizers and outreach personnel, the Global Team is also seeking translators who are fluent in Arabic and Turkish. To check out what positions are available, go to their website.

*Statue of Yuri Gagarin, the first man in space, at the Baikonur Cosmodrome. Credit: AFP*

So far, a total of 127 events have been registered in 38 countries, and on 7 continents. That’s right, an event has even been planned for Antarctica, specifically in Loung B3 at the South Pole Station (located at the geographic South Pole). So if you’re in the area – for whatever reason, possibly doing field studies on Emperor Penguins or something! – be sure to swing by!

To find an event in your neck of the woods, consult the full list here. And if you are interested in hosting one, you can register at the Yuri’s Night website. The website is also looking for donations to keep their volunteer and community efforts going.

Wherever you happen to land on April 12th, be sure to raise a glass to all those who have risked life and limb over the past fifty-plus years to establish humanity as a space-faring species!

Further Reading: Yuri’s Night

April 6, 2017April 28, 2017 by Matt Williams

A Star Going Supernova In Slow Motion Discovered

Artistic impression of a star going supernova, casting its chemically enriched contents into the universe. Credit: NASA/Swift/Skyworks Digital/Dana Berry

A supernova is a rare and wondrous event. Since these intense explosions only take place when a massive star reaches the final stage of its evolutionary lifespan – when it has exhausted all of its fuel and undergoes core collapse – or when a white dwarf in a binary star system consumes its companion, being able to witness one is quite the privilege.

But recently, an international team of astronomers witnessed something that may be even rarer – a supernova event that appeared to be happening in slow-motion. Whereas supernova of its kind (SN Type Ibn) are typically characterized by a rapid rise to peak brightness and a fast decline, this particular supernova took an unprecedentedly long time to reach maximum brightness, and then slowly faded away.

For the sake of their study, the research team – which included members from the UK, Poland, Sweden, Northern Ireland, the Netherlands and Germany – studied a Type Ibn event known as OGLE-2014-SN-13. These types of explosions are thought to be the result of massive stars (which have lost their outer envelop of hydrogen) undergoing core-collapse, and whose ejecta interacts with a cloud of helium-rich circumstellar material (CSM).

*OGLE-2014-SN-131 (blue circle) in a VLT acquisition (left), and an NTT image showing no visible host at the SN location (right). Credit: Karamehmetoglu et al.*

The study was led by Emir Karamehmetoglu of The Oskar Klein Center at Stockholm University. As he told Universe Today via email:

“Type Ibn supernovae are thought to be the explosions of very massive stars, surrounded by a dense region of extremely helium-rich material. We infer the existence of this Helium via the presence of narrow helium emission lines in their optical spectra. We also believe that there is very little, if any Hydrogen in the immediate surrounding of the star, because if it was there, it would show up much stronger than the Helium in the spectra. As you can imagine, this sort of configuration is very rare, since hydrogen is the most abundant element in the universe by far.”

As already noted, Type Ibn supernova are characterized by a sudden and dramatic increase in their brightness, then a rapid decline. However, when observing OGLE-2014-SN-131 – which they detected on November 11th, 2014 using the Optical Gravitational Lensing Experiment (OGLE) at the Warsaw University Astronomical Observatory – they witnessed something completely different.

“OGLE-2014-SN-131 was different because it took almost 50 days, as compared to the more typical ~1 week, for it to become bright,” said Karamehmetoglu. “Then it declined relatively slowly as well. The fact that it took several times longer than the typical rise to maximum brightness, which is unlike any other Ibn that has been studied before, makes it a very unique object.”

*The Optical Gravitational Lensing Experiment (OGLE), a project being undertaken by the Astronomical Observatory at the University of Warsaw. Credit: astrouw.edu.pl*

Thanks to data obtained by the OGLE-IV Transient Detection System, they were able to place OGLE-2014-SN-131 at a distance of about 372 ± 9 megaparsecs (1183.95 to 1242.66 million light years) from Earth. This was then followed-up with photometric observations using the OGLE telescope at the Las Campanas Observatory in Chile and the Gamma-Ray Burst Optical/Near-Infrared Detector (GROND) at the La Silla Observatory.

The team also obtained spectroscopic data using the ESO’s New Technology Telescope (NTT) at La Silla and the Very Large Telescope (VLT) at the Paranal Observatory (both located in Chile). In addition to having an unusually long rise-time, the combined data also indicated that the supernova had an unusually broad light curve. To explain all this, the team considered a number of possibilities.

For starters, they considered standard radio-active decay models, which are known to power the lightcurves of most other Type I and Type II supernovae. However, these could not account for what they had observed with OGLE-2014-SN-131. As such, they began considering more exotic scenarios, which included energy being input from a young, rapidly spinning neutron star (aka. a magnetar) nearby.

While this model would explain the behavior of OGLE-2014-SN-131, it was limited in that it is not yet known what circumstances would be needed to invoke a magnetar. As such, Karamehmetoglu and his team also considered the possibility that the explosions might be powered by shocks created by the interaction of ejected material from the supernova with the helium-rich CSM.

*Supernova 2008D in galaxy NGC 2770 (Type Ib), shown in X-ray (left) and visible light (right). Credit: NASA/Swift Science Team/Stefan Immler*

Thanks to the spectral data obtained by the NTT and VLT, they knew that such material existed around the star, and the model was therefore able to reproduce the observed behavior. As Karamehmetoglu explained, it is for this reason that they favor this model over the others:

“In this scenario, the reason OGLE-2014-SN-131 is different from other Type Ibn SNe is due to the unusually massive nature of its progenitor star. A very massive star, between 40-60 times the mass of our Sun, located in a low-metallicity galaxy, probably gave rise to this SN by expelling a great amount of helium-rich matter, then eventually exploding as a SN.”

In addition to being a unique event, this study also some drastic implications for astronomy and the study of supernovae. Thanks to the detection of OGLE-2014-SN-131, any future models that attempt to explain how Type Ibn supernovae form now have a stringent constraint. At the same time, astronomers now have an existing model to consider if and when they witness other supernovae which exhibit particularly long rise times.

Looking ahead, this is precisely what Karamehmetoglu and his colleagues hope to do. “In our next effort, we will study other, less-rare, types of SN that have long rise times, and therefore are probably created by very massive stars,” he said. “We will get to take advantage of the comparison frame-work we developed when studying OGLE-2014-SN-131.”

Once more, the Universe has taught us that two of the more important aspects of scientific research are adaptability and a commitment to continuous discovery. When things don’t conform to existing models, develop new ones and test them out!

Further Reading: arXiv

April 6, 2017 by David Dickinson

By Jove: Jupiter at Opposition 2017

Jupiter from January 7th, 0217. Image credit and copyright: Fred Locklear.

Been missing the evening planets? Currently, Saturn and Venus rule the dawn, and Mars is sinking into the dusk as it recedes towards the far side of the Sun. The situation has been changing for one planet however, as Jupiter reaches opposition this week.

Jupiter in 2017

Currently in the constellation Virgo near the September equinoctial point where the celestial equator meets the ecliptic in 2017, Jupiter rules the evening skies. Orbiting the Sun once every 11.9 years, Jupiter moves roughly one zodiacal constellation eastward per year, as oppositions for Jupiter occur about once every 399 days.

As the name implies, “opposition” is simply the point at which a planet seems to rise “opposite” to the setting Sun.

At opposition 2017 on Friday, April 7th, Jupiter shines at magnitude -2.5 and is 666.5 million kilometers distant. Jupiter just passed aphelion on February 16^th, 2017 at 5.46 AU 846 million kilometers from the Sun, making this and recent oppositions slightly less favorable. An April opposition for Jupiter also means it’ll now start to occur in the southern hemisphere for this and the next several years. Jupiter crosses the celestial equator northward again in 2022.

The path of Jupiter through 2017. Image credit: Starry Night.

Can you see Ganymede with the naked eye? Shining at magnitude +4.6, the moon lies just on the edge of naked eye visibility from a dark sky site… the problem is, the moon never strays more than 5′ from the dazzling limb of Jupiter. Here’s a fun and easy experiment: attempt to spot Ganymede through this month’s opposition season, using nothing more than a pair of MK-1 eyeballs. Then at the end of the month, check an ephemeris for greatest elongations of the moon. Any matches?

With binoculars, the first thing you’ll notice is the four bright Galilean moons of Io, Europa, Ganymede and Callisto. At about 10x magnification or so, Jupiter will begin to resolve as a disk. With binoculars, you get a very similar view of Jupiter as Galileo had with his primitive spy glass.

At the telescope eyepiece at low power you can see the main cloud bands of Jove, the northern and southern equatorial belts. Shadow transits and eclipses of the Jovian moons are also fun to watch, and frequent for the innermost two moons Io and Europa. Orbiting Jupiter once every seven days, transits of Ganymede are less frequent, and outermost Callisto is the only moon that can “miss” Jupiter on occasion, as it does this year until transits resume in 2020.

Jupiter an the Great Red Spot from January 29th, 2017. Image credit and copyright: Efrain Morales.

Jupiter’s one of the best planets for imaging: unlike Venus or bashful Mars, things are actually happening on the cloudtops of Jove. You can see smaller storms come and go as the Great Red Spot make its circuit once every 10 hours. Follow Jupiter from sunset through sunrise, and it will rotate just about all the way around once. Strange to think, we’ve been using modified webcams to image Jupiter for over a decade and a half now.

Jupiter and Io from 2006. Photo by author.

The major moons of Jupiter cast shadows nearly straight back as seen from our vantage point near opposition. After opposition, the shadows of the moons and the planet itself begin to slide to one side and will continue to do so as the planet heads towards quadrature 90 degrees east of the Sun. In 2017, quadrature for Jupiter occurs on July 5^th as the planet sits due south for northern hemisphere observers at sunset. Distances to Jupiter vary through opposition, quadrature and solar conjunction, and Danish astronomer Ole Rømer used discrepancies in predictions versus actual observed phenomena of Jupiter’s moons to make the first good estimation of the speed of light in 1676.

Double shadow transits are also interesting to watch, and a season of double events involving Io and Europa begins next month on May 12^th.

Jupiter will rule the dusk skies until solar conjunction on October 26^th, 2017.

It’s also interesting to note that while the Northern Equatorial Belt has been permanent over the last few centuries of telescopic observation, the Southern Equatorial Belt seems to pull a disappearing act roughly every decade or so. This last occurred in 2010, and we might just be due again over the next few years. The Great Red Spot has also looked a little more pale and salmon over the last few years, and may vanish altogether this century.

Finally, the Full Moon typically sits near a given planet near opposition, as occurs next week on the evening of April 10/11th.

Jupiter, the Moon and Spica on the evening of April 10th. Credit: Stellarium.

The next occultation of Jupiter by the Moon occurs on October 31^st, 2019.

Don’t miss a chance to observe the king of the planets in 2017.

– Here’s a handy JoveMoons for Android and Iphone for planning your next Jovian observing session.

-Be sure to check out our complete guide to oppositions, elongations, occultations and more with our 101 Astronomical Events for 2017, a free e-book from Universe Today.

-Send those images of Jupiter in to Universe Today’s Flickr forum.

April 5, 2017April 28, 2017 by Matt Williams

World’s Largest Rocket Will Be Recoverable & Reusable

The Falcon Heavy, once operational, will be the most powerful rocket in the world. Credit: SpaceX

When Elon Musk launched SpaceX in 2002, he did so with the intention of making reusability a central feature of his company. Designed to lower the costs associated with launches, being able to reuse boosters was also a means of making space more accessible. “If one can figure out how to effectively reuse rockets just like airplanes,” he said, “the cost of access to space will be reduced by as much as a factor of a hundred.”

And with last week’s successful launch of the first reusable Falcon 9 (the SES-10 Mission) Musk chose to unveil more details about his company’s next major milestone. According to Musk, the demonstration flight of the Falcon Heavy – which is scheduled to take place this summer – will involve two recovered Falcon 9 cores and the attempted recovery of the rocket’s upper-stage.

In other words, on its maiden flight, two of the three boosters sending the Falcon Heavy into orbit will be reused, and SpaceX may even try to attempt to make the first-ever recovery of a second stage. Such a feat, if successful, will signal that Musk’s dream of total reusability – where the first stage, payload fairings, and second stage of their launch vehicles are all recoverable – has come to fruition.

An artist's illustration of the Falcon Heavy rocket. Image: SpaceX — An artist’s illustration of the Falcon Heavy rocket. Image: SpaceX

According to details shared at the news conference that accompanied the launch of SES-10, Musk indicated that the test flight would make use of boosters that were recovered from two successful Falcon 9 launches, and that all three would be recovered after launch. As he was quoted as saying by Stephen Clark at SpaceFlightNow:

“That will be exciting mission, one way or another. Hopefully in a good direction. The two side boosters will come back and do sort of a synchronized aerial ballet and land. Two of the side boosters will land back at the Cape. That’ll be pretty exciting to see two come in simultaneously, and the center core will land downrange on the drone ship.”

On the following day – Friday, March. 31st, 11:44 am – Musk followed this up with a tweet that indicated that the test flight could also involve something that has never before been attempted. “”Considering trying to bring upper stage back on Falcon Heavy demo flight for full reusability,” he wrote. “Odds of success low, but maybe worth a shot.”

Such a plan is in keeping with what Musk had initially hoped for his company, which was to make all of its rockets entirely reusable. While reusable boosters were not a part of the initial designs for the Falcon Heavy, the numerous successful recoveries (on land and at sea) of the first stage of the Falcon 9 indicated that the Heavy‘s outer cores could be recovered and reused in the same way.

*Chart comparing the lift capacity of major launch systems to Low Earth Orbit (LEO). Credit: SpaceX*

Musk also reiterated that the demo flight would be taking place this summer, and that it would be carrying something comically-inspired. “Silliest thing we can imagine!” he tweeted, in response to a question of what the cargo would be. “Secret payload of 1st Dragon flight was a giant wheel of cheese. Inspired by a friend & Monty Python.”

For those unfamiliar with what Musk was referring to “The Cheese Shop”, a classic Monty Python sketch. From this, we can safely assume that Musk has something similar in mind for the inaugural Falcon Heavy launch. Perhaps some wine and bread to go with that cheese?

The demonstration flight – which will take place on launch pad 39A at the Kennedy Space Center in Florida – is already expected to be a momentous event. With the ability to lift payloads of over 64 metric tons (64,000 kg or 141,096 lbs) to Low Earth Orbit (LEO), the Falcon Heavy will be the most powerful rocket currently in operation.

In fact, its capacity will be about twice that of the Arianespace Ariane 5 and United Launch Alliance’s Delta IV Heavy rockets – which are capable of lifting 21,000 kg (46,000 lb) and 28,790 kg (63,470 lb) to LEO, respectively. However, SpaceX has indicated that the payload performance to geosynchronous transfer orbit (GTO) would be reduced with the addition of reusable technology.

Artist’s concept of the SpaceX Red Dragon spacecraft launching to Mars on SpaceX Falcon Heavy as soon as 2018. Credit: SpaceX

Whereas its original capacity to GTO was said to be 22,200kg (48,940 lb), full reusability on all three booster cores will reduce this to 7,000 kg (15,000 lb), while having two reusable outside cores will reduce it to approximately 14,000 kg (31,000 lb). But of course, these reductions in payloads have to be considered against significantly reduced launch costs.

For the time being, the plan is to recover all three boosters of the Falcon Heavy. This may change, depending on the success of the maiden flight, to the point where just the outer boosters are deemed reusable and the central core expendable. And depending on the success of the second stage recovery, SpaceX may begin pursuing reusability with the second stages of their Falcon 9 as well.

Musk has also indicated that at present, SpaceX will be primarily focused on the many commercial missions it has planned using the Falcon 9 launch vehicle. But if all goes according to plan, this summer will be the second time in the space of a single year that Musk’s and the aerospace company he started knocked it out of the park and silenced all those who said he was attempting the impossible.

Further Reading: SpaceFlightNow, SpaceX

April 5, 2017April 9, 2017 by Ken Kremer

Worlds’ 1st Recycled Booster from SpaceX Sails Serenely at Sunrise into Port Canaveral – Photo/Video Gallery

World’s first reflown rocket booster - the SpaceX Falcon 9 first stage - sails back into Port Canaveral, FL just before sunrise atop OCISLY droneship on which it landed 9 minutes after March 30, 2017 liftoff from KSC with SES-10 telecomsat - as seen entering channels mouth trailing a flock of birds from Jetty Park pier on April 4, 2017. Credit: Ken Kremer/Kenkremer.com

PORT CANAVERAL/KENNEDY SPACE CENTER, FL – Basking in the sunrise glow, the world’s first recycled booster – namely a SpaceX Falcon 9 – sailed serenely into Port Canaveral this morning, Tuesday, April 4, atop the tiny droneship on which it soft landed shortly after launching on March 30 for an unprecedented second time.

Shortly before sunrise, SpaceX’s recovered Falcon 9 first stage triumphantly arrived on Tuesday at the mouth of Port Canaveral and the public pier at Jetty Park around 7 am – greeted by excited onlookers, media and space buffs eager to be an eyewitness to the first rocket to launch and land two times fully intact !

The Falcon 9 standing proudly erect on the football field sized OCISLY droneship landing pad was towed into port by the Elsbeth III in the wee morning hours around 7 am. The ships made their way majestically along the channel westwards until reaching the docking port.

Check out this expanding gallery of eyepopping photos and videos from several space journalist colleagues and friends and myself – for views you won’t see elsewhere.

Click back as the arrival gallery grows !

Twice flown Falcon 9 first stage arrives into Port Canaveral on April 4, 2017 floating atop droneship. Credit: Julian Leek

The milestone SpaceX mission to refly the first ever ‘used rocket’ blasted off right on time at the opening of the dinnertime launch window on Thursday, March 30, at 6:27 p.m. EDT.

The used two stage 229-foot-tall (70-meter) rocket carried the SES-10 telecommunications payload to orbit using a ‘Flight-Proven’ Falcon 9 rocket from seaside Launch Complex 39A at NASA’s Kennedy Space Center (KSC) in Florida.

1st recycled SpaceX Falcon 9 booster is hoisted off OCISLY droneship after arriving and docking at Port Canaveral, FL on April 4, 2017. Credit: Ken Kremer/Kenkremer.com

After the 156 foot tall first stage booster completed its primary mission task, SpaceX engineers successfully guided it to a second landing on the tiny Of Course I Still Love You – OCISLY – drone ship for a soft touchdown some eight and a half minutes after liftoff.

“This is a huge revolution in spaceflight,” billionaire SpaceX CEO and Chief Designer Elon Musk told reporters at the post launch briefing at the Kennedy Space Center press site, barely an hour after liftoff.

Musk’s goal is to drastically reduce the cost of spaceflight so that it will one day lead to a ‘City on Mars’.

Recovered and twice flown and landed SpaceX Falcon 9 first stage stands chained to the deck of the OCISLY droneship as seen being towed into the mouth of Port Canaveral channels from Jetty Park pier on April 4, 2017. It launched on March 30, 2017 from KSC and delivered SES-10 telecomsat to GTO. Credit: Ken Kremer/Kenkremer.com

OCISLY had left Port Canaveral several days ahead of the March 30 launch and was prepositioned in the Atlantic Ocean some 400 miles (600 km) off the US East coast, just waiting for the boosters 2nd history making approach and pinpoint propulsive soft landing.

This recycled Falcon 9 first stage booster had initially launched a year ago in April 2016 for NASA on the SpaceX Dragon CRS-8 resupply mission to the International Space Station (ISS) under contract for the space agency.

Check out these exquisite videos showing various aspects of the Port arrival and processing:

Video Caption: This video shows the return of the first re-used SpaceX Falcon 9 booster to Port Canaveral on 4/4/17 in detail. After launching the SES-10 satellite on 3/30/17 it then landed on the OCISLY drone ship for the second time. The video highlights OCISLY’s return to port and docking. The booster was then hoisted off the droneship with a crane and stationed on a pedestal on land for processing. Credit: Jeff Seibert

Video Caption: The booster looks ready for another flight after arriving in to Port Canaveral, FL on 4 April 2017 and launching/landing from KSC on 30 March 2017. Elon Musk has said it will be put on display in Florida. This is a total game changer for the rocket industry. Credit:USLaunchReport

After making its way picturesquely through Port Canaveral channel, the droneship was docked, Workers soon attached a metal cap to the top of the first stage.

Next they removed the restraining chains fastening the booster to the deck. Next they hoisted it off the droneship with a work crane and transported it onto a work pedestal on the ground for further processing.

By late evening I observed that the workers were still busily operating on the booster. They were welding the metal cap to the top of the booster. All 4 landing legs were still attached as of 10 p.m. EDT on Tuesday, April 4.

The legs will soon be detached so the booster can be rotated horizontal and trucked back to the huge hangar at pad 39A.

Watch for Ken’s continuing coverage direct from onsite at the Kennedy Space Center press site and Cape Canaveral Air Force Station.

Workers weld cap to top of relaunched/recovered SpaceX Falcon 9 at night with gorgeous water reflections after hoisting it off the OCISLY droneship onto ground work platform at Port Canaveral, FL on April 4, 2017 . Credit: Ken Kremer/Kenkremer.com

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

Ken Kremer

Workers process the relaunched/recovered SpaceX Falcon 9 at night with gorgeous water reflections after hoisting it off the OCISLY droneship onto ground work platform at Port Canaveral, FL on April 4, 2017 . Credit: Ken Kremer/Kenkremer.com

SpaceX CEO and Chief Designer Elon Musk and SES CTO Martin Halliwell exuberantly shake hands of congratulation following the successful delivery of SES-10 TV comsat to orbit using the first reflown and flight proven booster in world history at the March 30, 2017 post launch media briefing at NASA’s Kennedy Space Center in Florida. Credit: Ken Kremer/Kenkremer.com

Closeup of base of reflown SpaceX Falcon 9 first stage rocket and 4 landing legs after Port Canaveral arrival on droneship on Apr 4, 2017. Credit: Julian Leek

ELSBETH III towing OCISLY and Falcon 9, next to Jetty Park pier at the entrance to Port Canaveral channel. Good fisherman story… “hey I think I just caught me a big rocket!” As reflown SpaceX Falcon 9 floats by on OCISLY droneship onlookers and fisherman watch from Jetty Park pier on 4 April 2017. Credit: Chuck Higgins

Slowly making their way down Port Canaveral channel as the Sun continues to rise on ELSBETH III towing OCISLY. Credit: Carol Higgins

Reflown SpaceX Falcon 9 on OCISLY is towed by ELSBETH III and slowly makes its way down Port Canaveral channel as the Sun continues to rise and buzzards keep watch. Credit: Jean Wright

1st reflown/relanded SpaceX Falcon 9 booster sails past pelicans and pleasure craft atop OCISLY droneship through Port Canaveral channel, FL on April 4, 2017. Credit: Ken Kremer/Kenkremer.com

April 4, 2017April 5, 2017 by Nancy Atkinson

Cassini’s Final Mission to Annihilation Starts April 22

This illustration shows Cassini above Saturn's northern hemisphere prior to one of its 22 Grand Finale dives. Credit: NASA/JPL-Caltech

Grab the tissues. This video nearly had the Cassini team all choked up during today’s press briefing, and virtual sobs and sniffs were abundant on social media posts sharing the video.

“We get goosebumps and get emotional every time we see it,” said Earl Maize, Cassini project manager at JPL.

On April 22 the Cassini spacecraft will begin its ‘Grand Finale’ — the beginning of the end of this tremendous mission that has provided breathtaking images and so many new discoveries of Saturn, its rings and moons. The mission will end on September 15, 2017, when it makes a dramatic plunge into the gas giant.

Here’s the video that had everyone teary-eyed. Be prepared for some stunning visuals:

Today, Maize talked about how nineteen countries and three space agencies contributed to the success of the Cassini/Huygens mission, saying the mission has been truly an international triumph and a phenomenal achievement.

“Cassini’s legacy is assured. We are in the books!” Maize said. “But the best is yet to come. We are going to dive into the gap between the rings of Saturn and Saturn’s atmosphere, a place where no spacecraft has ever gone. We’ll be going 70,000 mph (112,634 km/hr) into a 1,500-mile-wide (2,400-kilometer) gap, operating the spacecraft from a billion miles away.”

Cassini has been a relatively trouble free mission, and has made many discoveries about the Saturn system. So why crash the spacecraft?

Cassini is running out of fuel, basically running on fumes at this point.* And NASA needs to follow the protocol of planetary protection, and not allow a spacecraft with possible microbes from Earth to crash into a potentially habitable moon such as Enceladus or Titan.

“Cassini’s own discoveries were its demise,” Maize said. “Enceladus has a warm, salt water ocean. We can’t risk an inadvertent contact with this pristine body. The only choice was to destroy it (Cassini) in a designed fashion.”

Maize said that back in 2010, the team decided they would make the mission last as long as possible and use every last kilogram of propellant to explore the Saturn system as thoroughly as they could.

Cassini vs. Saturn. As depicted in this illustration, Cassini will plunge into Saturn’s atmosphere on Sept. 15, 2017. Using its attitude control thrusters, the spacecraft will work to keep its antenna pointed at Earth while it sends its final data, including the composition of Saturn’s upper atmosphere. Credit: NASA/JPL-Caltech

The final flyby of Titan on April 22 will ultimately alter Cassini’s trajectory and push it toward the spacecraft’s final demise. Maize described the gravity slingshot from Titan as a “last kiss goodbye that will push Cassini into Saturn. This is a roller coaster ride that we’re not coming out of.”

You can plot Cassini’s trajectory in JPL’s “Eyes on Cassini” special section of their Eyes on the Solar System website.

Cassini will make 22 passes through the gap, and in doing so, further our understanding of how giant planets, and planetary systems everywhere, form and evolve.

Project Scientist Linda Spilker said Cassini will be able to make close up measurements of Saturn and its rings to finally help us understand the mass and internal structure of Saturn. And the images should be absolutely stunning.

There’s the risk of dust or debris hitting the spacecraft, potentially crippling Cassini. But the risk is worth it, because if the spacecraft survives through even just a few of the close passes, the scientific payback will be incredible. However, even if the spacecraft is crippled and can’t send back its final science observations, the end is inevitable, as the path toward destruction will be written by the final ‘kiss’ from Titan.

“This is something we couldn’t try at any other time,” Maize said. “But now is time.”

A computer-generated representation of all Cassini’s Saturn orbits -affectionately called the “ball of yarn” by mission planners. The time frame spans Saturn Orbit Insertion on July 1, 2004 to the end of mission on Sept. 15, 2017. Credit: NASA/JPL-Caltech.

The Cassini team said the end of the mission will likely be a combination of excitement, pride and a sense of loss.

“I think that once the signal is lost, it would mean the heartbeat of Cassini is gone,” said Spilker. “I think there will be tremendous cheers and applause for the completion of an absolutely incredible mission. Hugs, tears — the Kleenex box will be passed around — but we will rejoice at being part of such a wonderful mission.”

See more images and information about the Grand Finale here.

For more of an inside look at Cassini, I devote a chapter of my book to the mission, with more insight from Earl Maize, Linda Spilker and others about the history and discoveries of the Cassini/Huygens mission, and additional details about the Grand Finale. “Incredible Stories From Space: A Behind-the-Scenes Look at the Missions Channging Our View of the Cosmos.”

Artist’s concept of Cassini orbiter crossing Saturn’s ring plane.
Credit: NASA/Jet Propulsion Laboratory.

*One of the Cassini team members said that as of today (April 4, 2017) Cassini has 36kg of hydrazine left for the thrusters, which are used everyday to orient the spacecraft, point the antenna towards Earth, point the instruments to their desired targer, etc. For the Titan flyby on April 22, about 10-15 kg. As for the bipropellant that runs the main engines, that’s a little more unknown and the one the team is worried most about running out of fuel. The team member said there is about 10 kg of that fuel left, “plus or minus 20 kilos [meaning there is true uncertainty about how much of this fuel remains]. We could run out today, or we could have 30 kilos left.”

April 4, 2017April 28, 2017 by Evan Gough

TRAPPIST-1 Is Showing A Bit Too Much Flare

Artist's impression of a system of exoplanets orbiting a low mass, red dwarf star. Credit: NASA/JPL

It turns out that the TRAPPIST-1 star may be a terrible host for the TRAPPIST planets announced in February.

The TRAPPIST-1 star, a Red Dwarf, and its 7 planets caused a big stir in February when it was discovered that 3 of the rocky planets are in the habitable zone. But now more data is coming which suggests that the TRAPPIST-1 star is much too volatile for life to exist on its planets.

Red Dwarfs are much dimmer than our Sun, but they also last much longer. Their lifetimes are measured in trillions of years, not billions. Their long lives make them intriguing targets in the search for habitable worlds. But some types of Red Dwarf stars can be quite unstable when it comes to their magnetism and their flaring.

Our own Sun produces flares, but we are protected by our magnetosphere, and by the distance from the Sun to Earth. Credit: NASA/ Solar Dynamics Observatory,

A new study analyzed the photometric data on TRAPPIST-1 that was obtained by the K2 mission. The study, which is from the Konkoly Observatory and was led by astronomer Krisztián Vida, suggests that TRAPPIST-1 flares too frequently and too powerfully to allow life to form on its planets.

The study identified 42 strong flaring events in 80 days of observation, of which 5 were multi-peaked. The average time between flares was only 28 hours. These flares are caused by stellar magnetism, which causes the star to suddenly release a lot of energy. This energy is mostly in the X-ray or UV range, though the strongest can be seen in white light.

While it’s true that our Sun can flare, things are much different in the TRAPPIST system. The planets in that system are closer to their star than Earth is to the Sun. The most powerful flare observed in this data correlates to the most powerful flare observed on our Sun: the so-called Carrington Event.The Carrington Event happened in 1859. It was an enormously powerful solar storm, in which a coronal mass ejection struck Earth’s magnetosphere, causing auroras as far south as the Caribbean. It caused chaos in telegraph systems around the world, and some telegraph operators received electric shocks.

Earth survived the Carrington Event, but things would be much different on the TRAPPIST worlds. Those planets are much closer to their Sun, and the authors of this study conclude that storms like the Carrington Event are not isolated incidents on TRAPPIST-1. They occur so frequently that they would destroy any stability in the atmosphere, making it extremely difficult for life to develop. In fact, the study suggests that the TRAPPIST-1 storms could be hundreds or thousands of times more powerful than the storms that hit Earth.

A study from 2016 shows that these flares would cause great disturbances in the chemical composition of the atmosphere of the planets subjected to them. The models in that study suggest that it could take 30,000 years for an atmosphere to recover from one of these powerful flares. But with flares happening every 28 hours on TRAPPIST-1, the habitable planets may be doomed.

The Earth’s magnetic field helps protects us from the Sun’s outbursts, but it’s doubtful that the TRAPPIST planets have the same protection. This study suggests that planets like those in the TRAPPIST system would need magnetospheres of tens to hundreds of Gauss, whereas Earth’s magnetosphere is only about 0.5 Gauss. How could the TRAPPIST planets produce a magnetosphere powerful enough to protect their atmosphere?

It’s not looking good for the TRAPPIST planets. The solar storms that hit these worlds are likely just too powerful. Even without these storms, there are other things that may make these planets uninhabitable. They’re still an intriguing target for further study. The James Webb Space Telescope should be able to characterize the atmosphere, if any, around these planets.

Just don’t be disappointed if the James Webb confirms what this study tells us: the TRAPPIST system is a dead, lifeless, grouping of planets around a star that can’t stop flaring.

April 4, 2017April 28, 2017 by Nancy Atkinson

Extraterrestrial Origin Of Fast Radio Burst Phenomenon Confirmed

Artist’s impression shows three bright red flashes depicting fast radio bursts far beyond the Milky Way, appearing in the constellations Puppis and Hydra, above the Mongolo radio telescope in Australia. Credit: James Josephides/Mike Dalley.

Fast Radio Bursts (FRBs) have puzzled astronomers since they were first detected in 2007. These mysterious milliseconds-long blasts of radio waves appear to be coming from long distances, and have been attributed to various things such as alien signals or extraterrestrial propulsion systems, and more ‘mundane’ objects such as extragalactic neutron stars. Some scientists even suggested they were some type of ‘local’ source, such as atmospheric phenomena on Earth, tricking astronomers about their possible distant origins.

So far, less than two dozen FRBs have been detected in a decade. But now researchers from the Australian National University and Swinburne University of Technology have detected three of these mystery bursts in just six months using the interferometry capabilities of the Molonglo Observatory Synthesis Telescope (MOST) in Canberra, Australia. In doing so, they were able to confirm that these FRBs really do come from outer space.

“Figuring out where the bursts come from is the key to understanding what makes them,” said Manisha Caleb, a PhD candidate at ANU, and lead author of a new paper. “While only one burst has been linked to a specific galaxy we expect Molonglo will do this for many more bursts.”

The unique long and narrow configuration of MOST provides a huge collecting area of about 18,000 square meters for a very large field of view, about 8 square degrees of the sky. In an effort to boost the capabilities of this telescope for hunting for the elusive FRBs, MOST has been upgraded and reconfigured, with the ultimate goal of localizing the bursts down to an individual galaxy.

Caleb produced software to sift through the 1,000 terabytes of data produced by MOST each day, and that allowed her and her team to make the three new FRB discoveries.

They determined the three new FRBs really were from space because the events were well beyond the 10,000 km near-field limit of the telescope, which ruled out local (terrestrial) sources of interference as a possible origin.

Caleb and her team wrote in their paper that they also demonstrated with pulsars that a repeating FRB seen with MOST has the potential to be localized quite precisely, which is “an exciting prospect for identifying the host,” they wrote.

Gemini composite image of the field around FRB 121102, the only repeating FRB discovered so far. Credit: Gemini Observatory/AURA/NSF/NRC.

So far, however, just one FRB has repeated, and although Caleb and her team were able to observe the area of each of the new FRBs for several hours, (105 hours following FRB 160317, 43 hours on FRB 160410 and 35 hours on FRB 160608) they found that “no repeat pulses were found from any of the FRB positions.”

But with the nature and source of these FRBs still being highly debated, the capabilities of MOST and an Australian collaboration called BURST provides the most promising hope for determining what FRBs truly are. The BURST project will perform deep FRB searches with MOSTS’s wide field-of-view and nearly constant single pulse searches of the radio sky. You can read more about the project here.

Read the team’s paper: The first interferometric detections of Fast Radio Bursts
Press release from Swinburne

April 4, 2017April 28, 2017 by Matt Williams

Venus 2.0 Discovered In Our Own Back Yard

Artist's impression of Kepler-1649b, the "Venus-like" world orbiting an M-class star 219 light-years from Earth. Credit: Danielle Futselaar

It has been an exciting time for exoplanet research of late! Back in February, the world was astounded when astronomers from the European Southern Observatory (ESO) announced the discovery of seven planets in the TRAPPIST-1 system, all of which were comparable in size to Earth, and three of which were found to orbit within the star’s habitable zone.

And now, a team of international astronomers has announced the discovery of an extra-solar body that is similar to another terrestrial planet in our own Solar System. It’s known as Kepler-1649b, a planet that appears to be similar in size and density to Earth and is located in a star system just 219 light-years away. But in terms of its atmosphere, this planet appears to be decidedly more “Venus-like” (i.e. insanely hot!)

The team’s study, titled “Kepler-1649b: An Exo-Venus in the Solar Neighborhood“, was recently published in The Astronomical Journal. Led by Isabel Angelo – of the SETI Institute, NASA Ames Research Center, and UC Berkley – the team included researchers also from SETI and Ames, as well as the NASA Exoplanet Science Institute (NExScl), the Exoplanet Research Institute (iREx), the Center for Astrophysics Research, and other research institutions.

*Diagram comparing the Solar System to Kepler 69 and its system of exoplanets. Credit: NASA Ames/JPL-Caltech*

Needless to say, this discovery is a significant one, and the implications of it go beyond exoplanet research. For some time, astronomers have wondered how – given their similar sizes, densities, and the fact that they both orbit within the Sun’s habitable zone – that Earth could develop conditions favorable to life while Venus would become so hostile. As such, having a “Venus-like” planet that is close enough to study presents some exciting opportunities.

In the past, the Kepler mission has located several extra-solar planets that were similar in some ways to Venus. For instance, a few years ago, astronomers detected a Super-Earth – Kepler-69b, which appeared to measure 2.24 times the diameter of Earth – that was in a Venus-like orbit around its host the star. And then there was GJ 1132b, a Venus-like exoplanet candidate that is about 1.5 times the mass of Earth, and located just 39 light-years away.

In addition, dozens of smaller planet candidates have been discovered that astronomers think could have atmospheres similar to that of Venus. But in the case of Kepler-1649b, the team behind the discovery were able to determine that the planet had a sub-Earth radius (similar in size to Venus) and receives a similar amount of light (aka. incident flux) from its star as Venus does from Earth.

However, they also noted that the planet also differs from Venus in a few key ways – not the least of which are its orbital period and the type of star it orbits. As Dr. Angelo told Universe Today via email:

“The planet is similar to Venus in terms of it’s size and the amount of light it receives from it’s host star. This means it could potentially have surface temperatures similar to Venus as well. It differs from Venus because it orbits a star that is much smaller, cooler, and redder than our sun. It completes its orbit in just 9 days, which places it close to its host star and subjects it to potential factors that Venus does not experience, including exposure to magnetic radiation and tidal locking. Also, since it orbits a cooler star, it receives more lower-energy radiation from its host star than Earth receives from the Sun.”

*Artist’s impression of a Venus-like exoplanet orbiting close to its host star. Credit: CfA/Dana Berry*

In other words, while the planet appears to receive a comparable amount of light/heat from its host star, it is also subject to far more low-energy radiation. And as a potentially tidally-locked planet, the surface’s exposure to this radiation would be entirely disproportionate. And last, its proximity to its star means it would be subject to greater tidal forces than Venus – all of which has drastic implications for the planet’s geological activity and seasonal variations.

Despite these differences, Kepler-1649b remains the most Venus-like planet discovered to date. Looking to the future, it is hoped that next-generations instruments – like the Transiting Exoplanet Survey Satellite (TESS), the James Webb Telescope and the Gaia spacecraft – will allow for more detailed studies. From these, astronomers hope to more accurately determine the size and distance of the planet, as well as the temperature of its host star.

This information will, in turn, help us learn a great deal more about what goes into making a planet “habitable”. As Angelo explained:

“Understanding how hotter planets develop thick, Venus-like atmospheres that make them inhabitable will be important in constraining our definition of a ‘habitable zone’. This may become possible in the future when we develop instruments sensitive enough to determine chemical compositions of planet atmospheres (around dim stars) using a method called ‘transit spectroscopy’, which looks at the light from the host star that has passed through the planet’s atmosphere during transit.”

The development of such instruments will be especially useful given joust how many exoplanets are being detected around neighboring red dwarf stars. Given that they account for roughly 85% of stars in the Milky Way, knowing whether or not they can have habitable planets will certainly be of interest!

Further Reading: The Astronomical Journal

April 4, 2017April 5, 2017 by Fraser Cain

Astronomy Cast Ep. 444: Fractals

For this historic 444th episode of Astronomy Cast, we talk about fractals. Those amazing mathematical visualizations of recursive algorithms. What are they, how do you get them? Why are they important?

Visit the Astronomy Cast Page to subscribe to the audio podcast!

We usually record Astronomy Cast as a live Google+ Hangout on Air every Friday at 1:30 pm Pacific / 4:30 pm Eastern. You can watch here on Universe Today or from the Astronomy Cast Google+ page.