Jisho

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Noun
1. outer atmosphere
Wikipedia definition
2. ExosphereThe exosphere is the uppermost layer of Earth's atmosphere. An upward traveling molecule moving through the exosphere fast enough to attain escape velocity can escape to space with a low chance of collisions; if it is moving below escape velocity it will be prevented from escaping from the celestial body by gravity. In either case, such a molecule is unlikely to collide with another molecule due to the exosphere's low density.
Read “Exosphere” on English Wikipedia
Read “外気圏” on Japanese Wikipedia
Read “Exosphere” on DBpedia

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