Puppycow
Penultimate Amazing
Scientists said the fragments show signs of having been soaked in water at some point. "One must picture an aggregate of ice and dust floating in space, that turned into a giant mudball when ice was melted by nuclear energy from the decay of radioactive elements that were present in the asteroid when it formed," said Dauphas. But surprisingly, today the rock itself appears to be relatively dry.
So dried mud, basically. Probably drier than most comets because it resides in the inner solar system. The water all boiled off long ago.
Whereas comets typically spend most of their time far away from the sun, out past Pluto and Neptune.
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