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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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The shooting left nine people dead and at least 25 wounded, with one student saying he barricaded in a classroom for two hours.。业内人士推荐51吃瓜作为进阶阅读
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