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Ancient Impacts Mysteriously Erased From Asteroid Vesta

Asteroid Vesta likely had enough impacts to erase a flurry of space rock collisions about four billion years ago.

February 18, 2016
12:10 PM EST
Some relatively fresh impact craters on Vesta's surface in the south polar region. The different images represent the same region viewed in different wavelengths of light by the Dawn spacecraft. | NASA, JPL-Caltech, UCLA, MPS, DLR, IDA
There's a sharp contrast between bright and dark material for the crater Marcia, viewed by the Dawn spacecraft. The bright material is believed to be Vesta's original stuff, while the darker material is thought to come from collisions with carbon-rich space rocks. | NASA/JPL-Caltech/UCLA/MPS/DLR/IDA/LPI/ASU