Busted 'em in the Cheops... The Rosetta robotic comet explorer is now in an orbit just 6 miles (10 km) from the surface of Comet 67P. The photo at right shows a “boulder” the team has dubbed “Cheops” sitting on an otherwise quite smooth surface. They don't know (yet) what the artifact is actually made of – it's more likely frozen gasses of some kind (methane, for instance) though it
could actually be rock. Rosetta's spectrograph and other instruments will figure this out over time...
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