mesosphere
/ˈmɛzəˌsfɪr/
noun
- The layer of Earth's atmosphere above the stratosphere and below the thermosphere, where temperatures decrease with altitude and meteors often burn up.
- Scientists study the mesosphere to understand how energy moves through the upper atmosphere.
- Meteors entering the atmosphere usually burn up in the mesosphere, creating bright streaks of light.
- The mesosphere is the coldest part of Earth's atmosphere, with temperatures dropping to around -90°C.