What is "exosphere"

n. 1 the uppermost layer of a planet's atmosphere 2 an extremely thin atmosphere, as on Saturn's moon Dione

n. the outermost atmospheric layer

The exosphere ( "outside, external, beyond", "sphere") is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is too low for them to behave as a gas by colliding with each other. In the case of bodies with substantial atmospheres, such as Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with interplanetary space. It is located directly above the thermosphere.

Several moons, such as the Moon and the Galilean satellites of Jupiter, have exospheres without a denser atmosphere underneath, referred to as a surface boundary exosphere. Here, molecules are ejected on elliptic trajectories until they collide with the surface. Smaller bodies such as asteroids, in which the molecules emitted from the surface escape to space, are not considered to have exospheres.

Exosphere (foaled 25 August 2012) is a Thoroughbred racehorse trained and bred in Australia. He won the Golden Rose Stakes, a Group one race, and has accumulated over a million dollars in winnings.