The Dawn mission team at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., have slowed the probe’s scheduled Aug. 25 gravitational escape from Vesta until early September while controllers check out high friction readings from a second spacecraft reaction wheel. The condition is not expected to affect the second leg of its eight-year main belt asteroid mission to Ceres, or data collection at the dwarf planet. The difficulty, which triggered a software shutdown of the spacecraft ...


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