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The exosphere (Auncient Greek: ἔξω éxō "ootside, freemit, ayont", Auncient Greek: σφαῖρα sphaĩra "sphere") is a thin, atmosphere-lik volume surroondin a planet or naitural satellite whaur molecules are gravitationally boond tae that bouk, but whaur the density is too law for them tae behave as a gas bi collidin wi each ither.[1]

References[eedit | eedit soorce]

  1. Steigerwald, William (17 August 2015). "NASA's LADEE Spacecraft Finds Neon in Lunar Atmosphere". NASA. Retrieved 18 August 2015.