An image taken by NASA's Dawn spacecraft on July 24, 2011, shows troughs along the equator of the asteroid Vesta, including Divalia Fossa, which is larger than the Grand Canyon. A new study analyzing ... more 
An image taken by NASA's Dawn spacecraft on July 24, 2011, shows troughs along the equator of the asteroid Vesta, including Divalia Fossa, which is larger than the Grand Canyon. A new study analyzing these troughs finds that they are probably g less 
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SPACE.com | Photo By NASA/JPL-Caltech/UCLA/MPS/DLR/IDA
Mon, Oct 1, 2012 7:24 AM EDT