👉 The thermosphere is a layer of ionized gases above Earth's atmosphere. It is located between the stratosphere and the mesosphere, extending from about 10 to 30 kilometers (6 to 19 miles) above Earth's surface. The thermosphere is composed primarily of oxygen, nitrogen, argon, and sulfur dioxide. The temperature at the thermosphere is typically around 25,000 degrees Celsius (-44,800 degrees Fahrenheit).