From Citizendium, the Citizens' Compendium
- See also changes related to Heterosphere, or pages that link to Heterosphere or to this page or whose text .
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- Atmosphere : The layers of gas surrounding stars and planets.
- Homosphere : Lower portion of a two-part division of the atmosphere (the upper portion is the heterosphere) according to the general homogeneity of atmospheric composition, which includes all of the atmosphere from the earth's surface to about 50 to 62 miles (80-100 kilometers).
- Thermosphere : Layer of the earth's atmosphere, directly above the mesosphere and directly below the exosphere, where ultraviolet radiation causes ionization and auroras also occur.