At 330 miles in diameter , Vesta is the second most massive physical object in the asteroid smash . On Friday 15 , NASA ’s Dawn spacecraft entered its orbit discharge its ion pusher to reduce its speed . Then it captured this double .
This is the first time a man - made objective has visit the main asteroid belt and enter orbital cavity around one of the objects dwell that area of the Solar System . Vesta is a remnant protoplanet . After finishing its mission there , Dawn will fire its ion engine again to channelise to Ceres , the largest soundbox in the belt . [ NASA ]
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