its the Mesosphere in this layer which extends from around 31 miles above the Earth's surface, the gases, including the oxygen molecules, are dense These gases in the mesosphere are thick enough to slow down meteors hurtling into the atmosphere, at this layer of the atmosphere is where they burn up, thus appearing like fiery trails in the night sky.
The Earth's atmosphere is divided into five layers. In the middle layer is where most foreign objects, such as meteors, will burn up as they enter the atmosphere. this layer is called the mesosphere
