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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"Your kids are only young once," says Gavin Arm, co-founder of Amsterdam-based small business Positivity Branding.。业内人士推荐im钱包官方下载作为进阶阅读
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