The altitude of the thermosphere stretches between 56 and 621 miles above Earth. The thermosphere is located between layers called mesosphere and exosphere. All three are atmospheric layers of the planet Earth.
The thermosphere expands as temperatures within its boundaries increase, and it contracts when the temperatures decrease. Because the thermosphere absorbs the majority of the UV radiation and x-rays from the sun, temperatures within the thermosphere can be very high. Temperatures reach as high as 3,632 degrees Fahrenheit. The thermosphere is considered part of space, even though it is actually part of Earth's atmosphere. Satellites and space shuttles are located within the thermosphere. The Southern and Northern Lights occur within this atmospheric layer as well.