Ceres is the largest thing in the asteroid belt,the band of rubble orbiting the Sun between Mars and Jupiter. At nearly 1000 kilometers wide, it’s technically a protoplanet — something that was on its way to becoming a full-fledged planet before it ran out of fabric to feed on and grow. That was over 4 billion years ago, and so you might expect it to be a dead,frozen world now, with nothing new happening on it geologically speaking apart from for possibly the odd asteroid impact or two.
Source: blastr.com