the layer of air or gases surrounding the earth or another planet; atmospheric layer

the outermost layer of the Earth's atmosphere where gases escape into space

the outermost layer of the atmosphere, located above the thermosphere, where gas molecules can escape into outer space

The layer of the Earth's atmosphere above the mesosphere and below the exosphere, characterized by increasing temperature with altitude; also known as the [[增温层|增溫層|zeng1 wen1 ceng2]].

The layer of the Earth's atmosphere located between approximately 50 and 85 kilometers above the surface; the temperature in this layer decreases as altitude increases.

(variant form) ozone layer

the boundary region between the mesosphere and the thermosphere