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A controlled deorbit requires the use of several core systems, including those for communications, power, and avionics. Some of the ISS machinery was not specifically certified to perform in a depressurized environment. (NASA believes that critical systems would remain operable, based on technical analyses, and emphasizes that many of these systems are already used in vacuum.) Another thing to worry about: the ISS losing control over its orientation in space. The spacecraft could start tumbling, flipping the station’s solar arrays away from the sun, taking the primary source of power with it.，更多细节参见91视频
The Rotating Stone’s external module houses a LIDAR sensor for hands-free control. By simply waving your hand or a pizza peel, you can start or stop the rotation. What’s more, Ooni says the Rotating Stone can be installed in less than 10 minutes.。谷歌浏览器下载对此有专业解读
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