These mosaic images from NASA's Dawn mission show how dark, carbon-rich materials tend to speckle the rims of smaller craters or their immediate surroundings on the giant asteroid Vesta. The image on ... more 
These mosaic images from NASA's Dawn mission show how dark, carbon-rich materials tend to speckle the rims of smaller craters or their immediate surroundings on the giant asteroid Vesta. The image on the left is Numisia Crater and the image on less 
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SPACE.com | Photo By NASA/JPL-Caltech/UCLA/MPS/DLR/IDA
Sun, Jan 6, 2013 10:36 AM EST