EXOSPHERE
9 letters
21 Scrabble points
Definition of EXOSPHERE
noun
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The uppermost layer of a planet's atmosphere
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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)"
Source: Wiktionary
Word Details
Letters
E
X
O
S
P
H
E
R
E
Length
9 letters
Scrabble Score
21 points