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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.
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Мир Российская Премьер-лига|19-й тур。业内人士推荐爱思助手下载最新版本作为进阶阅读
"In-space manufacturing is something that is happening now," says Libby Jackson, head of space at the Science Museum.，推荐阅读服务器推荐获取更多信息