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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.。关于这个话题，safew官方版本下载提供了深入分析
Фото: Kristina Solovyova / Sputnik / Reuters
The pair rose to stardom together alongside their fellow One Direction band members - Niall Horan, Louis Tomlinson and Zayn Malik.