As a noun exosphere is
exosphere (layer of the earth's atmosphere).
termosphere
Not English
Termosphere has no English definition. It may be misspelled.
English words similar to 'termosphere':
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exosphere
Noun
(
en noun)
the uppermost layer of a planet's atmosphere
an extremely thin atmosphere, as on Saturn's moon Dione
* "Scientists weren't even sure Dione would be big enough to hang on to an exosphere " ('Cassini Detects Hint of Fresh Air at Dione', Cassini Solstice Mission, JPL, Mar. 02, 2012)
