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.
When asked by the BBC about the formulation of the deal and whether mistakes had been made, an NHS spokesperson said there were "several factors which influence a procurement strategy and construct of the contract", without elaborating further.，更多细节参见safew官方版本下载
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