Rosetta images reveal crack hundreds of meters long in comet 67P


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Image of Comet 67P taken by ESA’s Rosetta (Click Image to Download)

The European Space Agency (ESA) succeeded in delivering the Philae lander to the surface of comet 67P several months ago, but its Rosetta probe hasn’t been twiddling its robotic thumbs since then. It’s still in orbit of 67P/Churyumov–Gerasimenko to study the comet as it gets closer to the sun. In the newest set of images published by the ESA, scientists reveal 67P is coming apart at the seams. A huge crack was discovered running hundreds of meters along the surface.

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To visualize what’s happening, it’s important to know a little about the shape of 67P/Churyumov–Gerasimenko. Many of us have an idea of comets as being more or less round, but many of them are actually quite oddly shaped. For example, 67P has two lobes, one smaller than the other, connected by a narrow neck. It looks a little like a rubber duck. The crack detected by Rosetta’s Osiris camera is in the neck region, which is also where most of the gas and dust is being expelled.

The crack is about one meter in width, which wouldn’t be so impressive if it wasn’t covering such a large area. The neck region where the crack was found is only 1km wide after all, so a few hundred meters is nothing to sneeze at. In the image above, the crack is visible in two locations on the surface, but the middle section is obscured by layers of dust, which the ESA team has found is plentiful on the surface of 67P, especially in the neck region where the object’s minimal gravity is even less substantial.

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67P won’t reach its closest approach to the sun for several months, but it’s already losing more than 11kg of gas and dust every second. Scientists are unsure if the crack will worsen or close up as the comet continues to lose weight. If the stresses on the neck increase, the comet could fracture and break in two .
Some researchers believe that 67P’s shape is the result of two smaller objects colliding in the distant past, so this crack could be following an existing “fault line” in the structure. It’s also possible this crack is nothing out of the ordinary for porous comets like 67P as they erode. It’s hard to say for sure — this is the first time we’ve gotten such a close-up look at a comet.

Rosetta dropped the Philae lander off on 67P back in November, but it didn’t quite go as planned. The lander’s harpoons failed to fire, which caused it to bounce along the surface, eventually coming to rest in a shadow that prevented the solar panels from creating enough power. After doing most of its science, Philae went to sleep. The ESA has continued to monitor conditions on the comet with Rosetta and hopes that when the comet nears the sun, it will shine more light on Philae, allowing it to come back online.

Philae isn’t close enough to the neck region to offer any insights about the newly discovered crack, but it can certainly tell us more about the composition of 67P. Even if Philae never comes back online, Rosetta will keep an eye on the surface from a few kilometers up. It will be there through 67P’s solar perigee in August, and will follow as it heads back out toward Jupiter.

Source : Geek.com

Top 10 great space moments in 2014 (pictures)


Source :c|net

It was a big year for space exploration, from rodeo-riding a comet to getting more familiar with Mars, distant planets and the beginning of it all.

1. Rosetta and Philae meet a comet

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Photo by: ESA/Rosetta/Philae/ROLIS/DLR  (Click Image to Image)

The first successful soft landing on a comet wasn’t just the biggest space story of the year. It was probably also the biggest science story of 2014.

The European Space Agency’s Rosetta spacecraft traveled 10 years to drop the Philae lander onto a comet. The landing was bumpy, but scientists were able to conduct a few days worth of experiments on the comet’s surface that first week.

But neither Rosetta nor Philae may be finished yet.

Look for more great science from both in 2015.

2. Orion lifts off

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Orion lift Off (Click Image to download)

A new era in space exploration began in December with the successful test flight of the Orion spacecraft, thanks to a big assist from some massive, heavy rockets.

Orion is scheduled to make an unmanned trip to the moon, but it is later expected to carry manned missions to an asteroid and Mars.

3. New Horizons awakens

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Artist ‘s Impression of New Horizons near Pluto and its moon Charon (Click Image to Download)

Rosetta wasn’t the only spacecraft to wake up after a long journey in 2014. In December, NASA’s New Horizons probe switched itself back “on” after a 1,873 day-long hibernation.

Originally launched in 2006, the craft is on track for its mission to survey Pluto and its moons in 2015.

4. India’s Mars Orbiter Mission

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Mars Picture taken by ISRO’s MOM (Click Image to Download)

The Mars Orbiter Mission (MOM), also called Mangalyaan is a spacecraft orbiting Mars since 24 September 2014. It was launched on 5 November 2013 by the Indian Space Research Organisation (ISRO). It is India’s first interplanetary mission and ISRO has become the fourth space agency to reach Mars, after the Soviet space program, NASA, and the European Space Agency. It is also the first nation to reach Mars orbit on its first attempt, and the first Asian nation to do so.

5. Comet buzzes Mars

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In October, we got a rare close look at a comet on a once-in-a-million-years journey. The comet came so close to Mars that humanity’s orbiters circling the Red Planet actually had to hide on the other side to avoid the comet’s debris cloud.

The orbiters and rovers on the surface were still able to capture images of the comet as it whizzed by.

6. Exoplanets everywhere

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In 2014, not only did our knowledge of distant exoplanets grow by leaps and bounds, but so did the evidence that many of them might host the elements to support life as we know it.

As of December 15, 2014, we know of 22 planets beyond our solar system where there is reason to believe they could be habitable.

7. Space is still hard

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2014 was not a year without tragedy in space and near-space exploration. In October, Virgin Galactic’s SpaceShipTwo crashed, killing one pilot.

This came within days of an explosion that happened after the liftoff of an unmanned Antares rocket carrying a payload to the International Space Station. Also, in August a SpaceX rocket exploded over Texas during a test flight.

In a year when science began to make amazing feats look easy, these were three reminders of the old adage that “space is hard.”

8. ALMA’s Image of Another Solar System

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The best image ever of planet formation around an infant star.

It’s a real image of a planet-forming disk around the infant star, in this case a sunlike star approximately 450 light-years from Earth, known to astronomers as HL Tau.

It is impressive. It reveals in great detail what astronomers just a few decades ago were only theorizing about, and that is that all stars are believed to form within slow-spinning clouds of gas and dust. As the clouds spin, they flatten out into these disks. Over time, the dust particles in the cloud begin to stick together by a process known as acretion, and that process is what ultimately forms the planets like our Earth, and moons like our moon, plus the asteroids, all of which mostly still move (as they did in the original cloud) in this flat space – this disk-like space – encircling the parent star.

9.Aiming for Manned Missions to Mars

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In a year when Mars rovers continued to expand our understanding of the Red Planet, momentum continued to build for a manned mission to our distant neighbor.

NASA is looking seriously at “deep sleep” methods to easily get humans to Mars, likely in the 2030s. Elon Musk started talking about getting mankind to Mars in half that time, and Mars One is already looking for astronauts to blast off in less than a decade’s time, despite potential problems.

10. Racing back to the moon

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Mars is cool, but isn’t there more to do on the moon?

Lunar Mission One is just one of the teams that thinks so — it raised about a million dollars for its plan to drill the moon’s south pole.

Meanwhile, teams competing in the Google Lunar XPrize continued working toward returning to our lone natural satellite.

The moon, Mars, comets, asteroids and beyond — stay tuned to @crave to see where we go in 2015.

Philae reveals presence of large amount of water ice on the comet


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A comet seen from close up – the surface looks like rock, but is a mixture of water ice, carbonaceous particles and interesting compounds. Image credit: ESA/Rosetta/Philae/ROLIS/DLR  (Click Image to Download ) 

The European Space Agency has revealed that the comet – 67P/Churyumov-Gerasimenko “is not nearly as soft and fluffy as it was believed to be”.

The first results to emerge from the team of the SESAME experiment (Surface Electrical, Seismic and Acoustic Monitoring Experiment) confirm that “the strength of the ice found under a layer of dust on the first landing site is surprisingly high”.

“The mechanical properties of 67P will be derived. SESAME’s two other instruments suggest that cometary activity at this landing site is low, as well as revealing the presence of a large amount of water ice under the lander,” Klaus Seidensticker from the DLR Institute of Planetary Research said.

Source : Times of india , SEN Blog

Japan readies asteroid probe for lift off


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Japan will send space probe Hayabusa2 on Sunday (Nov 30) on a six-year mission to mine a distant asteroid, in the hopes of answering some fundamental questions about life and the universe.

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(Click Image to Download)

Japan will send a space probe this weekend on a six-year mission to mine a distant asteroid, just weeks after a European spacecraft’s historic landing on a comet captivated the world’s attention.

Hayabusa2 is set to blast off aboard Japan’s main H-IIA rocket from Tanegashima Space Center in southern Japan on Sunday (Nov 30). The ¥31 billion (US$260 million) project is sending the kit towards the unpoetically-named 1999 JU3 asteroid in deep space. It will blast a crater in the asteroid to collect virgin materials unexposed to millennia of solar wind and radiation, in the hope of answering some fundamental questions about life and the universe.

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“The asteroid is carbonaceous and we may find organic matter and water, the stuff of life,” Hitoshi Kuninaka, project leader at the Japan Aerospace Exploration Agency (JAXA), said in an interview posted on the agency’s website. Analysing the extra-terrestrial materials could help shed light on the birth of the solar system 4.6 billion years ago and offer clues about what gave rise to life on Earth, he said.

Hayabusa2, about the size of a domestic refrigerator, is expected to reach the asteroid in mid-2018 and will spend around 18 months studying the surface. It will also drop tiny MINERVA-II rover robots as well as a French-German landing package named Mobile Asteroid Surface Scout (MASCOT) for surface observation.

GALACTIC FIRST

In a galactic first, Hayabusa2 will drop an “impactor” that will explode above the asteroid’s surface and fire a metal bullet into the crust at a speed of 7,200 kilometres an hour – six times the speed of sound on Earth. The bullet is expected to create a small crater that will enable the probe to collect material from the asteroid. “The impactor is made fully with Japanese technologies that are so advanced you would think they are out of this world,” said Kuninaka.

The Hayabusa2 mission will blast off just weeks after the European Space Agency succeeded in making mankind’s first-ever landing on a comet this month. Scientists said initial data sent from the robot lab Philae showed traces of organic molecules and a surface much harder than imagined.

Philae, released from its mothership Rosetta, has gone into hibernation on comet 67P/Churyumov-Gerasimenko, having used its onboard battery power after 60 hours of prodding and probing. Engineers hope the lander’s solar panels will charge its batteries in the coming months as the comet, with Philae hopefully still clinging to its surface, moves closer to the Sun.

If the Hayabusa2 mission goes well, pristine asteroid samples will be returned to Earth in late 2020. JAXA aims to bring 100 milligrams (1/286th of an ounce) of samples to Earth after a round trip of more than five billion kilometres.

The probe is the successor to JAXA’s first asteroid explorer, Hayabusa – the Japanese term for falcon – which returned to Earth in 2010 with dust samples after a trouble-plagued seven-year mission.

The spherical 1999 JU3 asteroid, which is around a kilometre across, is believed to contain significantly more organic matter and water than the potato-shaped rock studied by the original Hayabusa. Despite various setbacks during its epic seven-year odyssey, including intermittent loss of communication and damage to its motors, the first Hayabasa was hailed as a triumph of science when it returned to Earth.

Source : Channel news asia

Philae’s Incredible Comet-Landing Sequence Shows Up In Fresh Rosetta Images


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Images from the Rosetta spacecraft show Philae drifting across the surface of its target comet during landing Nov. 12, 2014. Credit: ESA/Rosetta

New images released from the Rosetta spacecraft orbiting Comet 67P/Churyumov–Gerasimenko show the spacecraft coming in for its (first) landing on Wednesday (Nov. 12). “The mosaic comprises a series of images captured by Rosetta’s OSIRIS camera over a 30 minute period spanning the first touchdown,” wrote the European Space Agency in a blog post today (Monday).

This is just the latest in a series of images coming from the orbiting Rosetta spacecraft showing the Philae lander coming in for its rendezvous with 67P. A major next step for the mission will be figuring out where the lander actually came for a rest, but there’s plenty of data from both Rosetta and Philae to comb through for this information, ESA said.

What’s known for sure is Philae made three touchdowns on the comet — making history as humanity’s first soft-lander on such an object — stopping in a shady area that will make recharging its solar panels difficult. The spacecraft is in hibernation as of Friday (Nov. 17) and scientists are really, really hoping it’s able to charge up for another science session soon. Rosetta, meanwhile, is hard at work above and will continue to follow the comet in 2015.

Source : universe today

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Philae sleeps, but Rosetta’s not done yet


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Its battery dead, the European lander is lost in a crater somewhere on a huge comet. But the orbiter that brought it there still has plenty of science left to do.

Rosetta

As of Saturday morning, the Philae lander is in a digital coma somewhere on the surface of comet 67P/Churyumov-Gerasimenko. But even if the history-making little robot never wakes again, the Rosetta mission and the orbiter of the same name still have a long journey ahead of them.

The plan was for Philae to land at a targeted site on the comet, firing harpoons into the surface of the icy rock to keep itself locked in place for a long trip around the sun. The strong grip was particularly important since a comet this size has only a tiny fraction of the gravity of a place like Earth, leaving little Philae at risk of floating off into space.

But when showtime came, there were problems with Philae’s downward thrusters and with firing the harpoons. The European Space Agency reports that the lander bounced off the surface of the comet twice and eventually landed somewhere else without much access to the sunlight its solar panels need to keep it functioning.

Friday evening, Philae used its remaining energy to upload all its data before going into hibernation mode. There was a time slot early this morning during which, the ESA had reported, communication with the lander was possible, but that time has now come and gone.

Still, Rosetta remains.

Even if Philae stays lost in a comet crater for the next year, the orbiter that traveled almost half a billion miles to get to this point will continue to orbit the comet and its lost lander.

Right now, Rosetta has been pulling out to a 30 kilometer orbit of the comet. It will come closer again early next month to get more details on the comet — some of its flybys will be as close as 8 kilometers to the comet. There’s a whole lot of potential science and data about comets, planets and our solar system packed in that process, building up to the trio’s closest encounter with the sun, next August.

Before that point there may also be better opportunities to rouse Philae.

Continue reading Philae sleeps, but Rosetta’s not done yet