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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.。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读
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numbers are sometimes later products but not always; some prefixes mean specific