Astronomers proposed a novel explanation for the strange appearance of the comet carrying Europe's robot probe: microscopic aliens.
Scientists have found gigantic sinkholes more than 200 yards (183 meters) in diameter -- twice the length of a football field -- and just about as deep breaking the surface of the comet being studied by the orbiting Rosetta spacecraft.
Titan's alien lakes of methane may be formed from the same processes that create sinkholes on Earth.
Ready for your close-up? How spacecraft changed our image of moons, planets and other objects in our solar system.
After a 7-month hiatus, the revived European comet lander is nearly ready to resume work, expanding on our scientific understanding of the solar system.
Could this bright glinting object on Comet 67P/Churyumov-Gerasimenko's surface be Europe's lost comet lander?
Three crewmembers who have been aboard the International Space Station for an extended, 6.5-month mission will be heading home on Thursday, with no launch date set for their replacements.
Europe launched a new bid Friday to communicate with its comet lander Philae, hurtling towards the sun some 360 million kilometers (224 million miles) from Earth.
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