NASA's Dawn spacecraft is completing its time orbiting the asteroid Vesta, but the planned continuation of its mission to the dwarf planet Ceres might be in some doubt.
Earlier this month, a reaction wheel on the probe malfunctioned. Reaction wheels keep a craft properly oriented in space. Thus is the second problem Dawn has had with a reaction wheel.
NASA dealt with the first issue, and continues to prepare for a flight to Ceres.
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