The exosphere ( "outside, external, beyond", "sphere") is a thin, atmosphere-like volume surrounding a planetary body where molecules are gravitationally bound to that body, but where the density is too low for them to behave as a gas by colliding with each other. In the case of bodies with substantial atmospheres, such as the Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with interplanetary space.
例句与用法
1.
This region is called exosphere . 这层大气称为外逸层。
2.
Above the troposphere is the stratosphere , followed by the ionosphere and capped by the exosphere 在对流层上是平流层，接着是电离层，最上层是外逸层。
3.
The plasma affects the magnetic field , contributes to the “ space weathering ” of the planet ' s surface , and sputters material from the surface to populate the exosphere 等离子体影响磁场，有助于将"太空风化"的这个星球的表面上，并屡有起伏，从材料的表面，以填充exosphere 。
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