EXOSPHERE
Scrabble letter values: E1X8O1S1P3H4E1R1E1 = 21
Definition
- noun the outermost atmospheric layer.
Examples
- “"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)”