Speed in ur article is not correct! “@mashable: NASA's Dawn spacecraft starts its approach toward dwarf planet Ceres http://on.mash.to/1AfyDof ”
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@mashable: Crazy Engineering: Ion Propulsion and the Dawn Mission https://youtube.com/watch?v=5OFgJwdZxRc …Thanks. Twitter will use this to make your timeline better. UndoUndo
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