在重新进入大气层的过程中，大部分航天器会在穿过地球大气层时燃烧殆尽。
During re-entry, most of the spacecraft will burn up while passing through the Earth's atmosphere.
来自外太空的各种宇宙射线通过空气进入大气层，但来自太阳的大量辐射却被屏蔽了。
Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are screened off.
由于卫星高度较低，碎片几乎直接进入大气层。
Because of the satellite's relatively low altitude, debris began re-entering the atmosphere almost straight away, the us defence department said.
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