Dawn Mission

Dawn is a NASA Discovery mission that targeting Vesta and Ceres, the two most massive asteroids. It entered orbit around Vesta in July 2011, then departed a year later. It will arrive at Ceres in February 2015, making it the first probe ever to orbit two astronomical bodies other than Earth.

Asteroids

But the next year, astronomers found a second object in a similar orbit, then another, and another. Instead of a

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