The young asteroid Vesta started off as a round protoplanet, but a massive collision early in its life caused it to become more elliptical in shape and created the giant crater Rheasilvia, scientists ... more 
The young asteroid Vesta started off as a round protoplanet, but a massive collision early in its life caused it to become more elliptical in shape and created the giant crater Rheasilvia, scientists say. This image is an artist's illustration less 
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SPACE.com | Photo By Martin Jutzi
Wed, Feb 13, 2013 1:24 PM EST