What is the mesoshpere?

The mesosphere is the third layer of Earth's atmosphere, situated above the stratosphere and below the thermosphere, extending from about 50 to 85 kilometers (31 to 53 miles) above sea level. In this layer, temperatures decrease with altitude, reaching as low as -90 degrees Celsius (-130 degrees Fahrenheit). The mesosphere is where most meteors burn up upon entering Earth's atmosphere. It also plays a role in atmospheric dynamics and the formation of noctilucent clouds.