And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.
NASA described the evacuation as a "controlled expedited return," rather than an emergency deorbit, which would mean departing the station immediately, regardless of the landing's timing, sea conditions, or weather.
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The latest rugby union news and analysis, plus all the week’s action reviewed，更多细节参见旺商聊官方下载
Image Credit: Sausly. Federica Mercuriello.
A pod of dolphins circled the craft.