There are few things sadder than the end of a close friendship. Whether it happens in a sudden moment of betrayal or after years of gradual separation, the feelings of loss can stay with you for a lifetime.
Anna HolliganBusiness reporter, Amsterdam，详情可参考heLLoword翻译官方下载
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Mostly. This is because, theoretically, we could still save the ISS and move it into higher orbit. NASA has calculated that propelling the station more than 640 kilometers above Earth would keep it alive for 100 years—and also require at least 18.9 metric tons of propellant. That’s roughly 2,000 airline carry-ons. A thousand years would require at least 36 metric tons. If that doesn’t seem like very much, consider the fact that, right now, no vehicle can transport that amount of gas to the station. The still-in-development SpaceX megarocket Starship might be able to haul a significant percentage, but it would struggle to dock with the station, according to the space agency’s estimations.