In the vacuum of space, the amount of debris—spent rocket stages, splintered satellites, micrometeoroids—numbers in the millions, all zooming about, often at 17,000 mph speeds. They’re also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn’t completely clean.
另一方面，他的一些朋友遭到ICE的抓捕，這同樣令他感到擔憂。
。safew官方版本下载对此有专业解读
To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.
7000: FRP 服务端连接端口