| 词汇 | exosphere |
| 释义 | exosphere noun environment specializeduk /ˈeks.əʊ.sfɪər/ us /ˈeks.oʊ.sfɪr/ [ C ] the part of a planet's atmosphere that is farthest from the planet : What is happening in Mercury's exosphere? An exosphere is the upper part of any planetary atmosphere, where the density of atoms is so low that they don't collide with each other. the exosphere [ S ] the part of the earth's atmosphere that is farthest from the earth: （地球的）外逸层 The temperature at the base of the exosphere is about 1300 K. Atoms of hydrogen, helium, sodium, potassium and calcium have been seen in the exosphere. See also asthenosphere the atmosphere biosphere hydrosphere ionosphere lithosphere mesosphere stratosphere thermosphere troposphere The top of the earth's atmosphere has an exosphere. Particles can lose energy of motion by colliding with satellites, rings, or exospheres. Beyond these, the exosphere thins out into the magnetosphere. The rate of thermal escape depends on the temperature of the exosphere and on the gravitational field. The Earth & outer space - general words ablate alluvium anti-gravity atmosphere atmospherically auroral geo- geocentric horizon hydrosphere infinite lithosphere lithospheric macrocosm mesosphere mesospheric microgravity the Big Bang underground zero gravity Manned spaceflights are still limited to the exosphere, the highest level of the Earth’s atmosphere. |
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