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What is the thermosphere?
Thermosphere is the fourth layer of Earth's atmosphere. “Thermosphere” is derived from the Greek word thermos, meaning heat. When the sun emits high levels of radiation, the thermosphere heats up and expands. Temperatures can get extremely hot, rising to 1,500°C (2,732°F). The space shuttle and the International Space Station both orbit Earth within the thermosphere. The aurorae (Northern and Southern Lights), which are natural light displayed in the sky, also occur in this layer of the atmosphere.