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Earth and Space Sciences · 术语表

什么是 Exobase; exosphere?

又称: exobase · exosphere

Definition 27.3 University Earth and Space Sciences — Year 3 · 第 27 章 — Planetary Atmospheres and Habitability

The exobase of an atmosphere is the level at which the mean free path of its particles equals the scale height. Above it, the exosphere, a particle moving upwards is unlikely to meet another, and one faster than the local escape velocity leaves the planet.

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