在宇宙空间基本上按照天体力学规律运行的各种人造物体。天文学中将宇宙间的各种星体统称为天体并将天体分为自然天体和人造天体两类。人造天体包括航天器和空间垃圾。空间垃圾包括废弃的航天器、运载火箭末级残体和碎片等。
尽管大多数陨石都是天然形成的，但也有少数人造天体会落入大气层，变成流星，甚至是“陨石”！
While most meteorites are natural in origin, on occasion manmade space debris can reenter the atmosphere and also become a meteor or even a meteorite!
太阳风暴威胁着所有的围绕地球运行的人造天体，包括GPS定位和通讯卫星，载人航天飞机和国际空间站。
Solar flares threaten all of the artificial objects orbiting our planet including GPS and telecommunications satellites occupied spacecraft and the International space Station.
而且我们现在也认为时间是普遍存在的东西，即使所有的时钟、所有天体，所有人造产品都停止运行，它依然一刻不停地流逝。
It's also because we've come to think of time as something universal, something that would keep marching on even if all clocks, celestial or man-made, were to stop.
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