And junk begets junk, as each collision creates more fragments-a phenomenon known as the Kessler syndrome, after Donald Kessler, an American physicist who postulated it in the 1970s.
碎片生碎片，因为每次碰撞产生更多的碎片——这就形成一种叫“凯斯勒综合症”的现象，也就是美国物理学家唐纳德·凯斯勒在上世纪七十年代创立的一种假说。
After they collision... they hit each other, we agreed that they would stick, there was glue on it.
在碰撞之后，它们相互撞击，它们会粘在一起，表面涂了胶水。
Nasa scientists are closely monitoring the skies after two satellites crashed into each other over Siberia, in what experts have said is the first collision of its kind.
在这起被称为有史以来首例的撞击——两卫星在西伯利亚上空撞击——之后，Nasa的科学家们就开始了对太空的严密观察。
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