thermosphere Hear it!

thermosphere definition

thermo·sphere (t̸hʉr′mə sfir′)

noun

the atmospheric zone or shell located above the mesopause beginning at an altitude of c. 85 km (53 mi) and characterized by a great rise in temperature with increasing altitude

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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