单词	exosphere
释义	exosphere /ˈɛksə(ʊ)sfɪə / noun Astronomy The outermost region of a planet’s atmosphere.From the bottom of the exosphere the atmosphere has a thickness of 400 km.... Since collisions are negligible above the exobase, the molecules in this region, called the exosphere, move along ballistic trajectories under the action of the earth's gravitational field. Then more indicators flashed to life as the ship skimmed the outer exosphere at Mach 27. Derivatives exospheric adjective ... He has evaluated the escape flux averaged over an entire 11-year cycle of solar activity, using satellite data on exospheric temperature. He did not know how much time that his fleet had before the exospheric trap's consequences manifested.
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