Earth's atmosphere ends quite abruptly at an altitude of 40 kilometers.

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Earth's atmosphere extends much further than 40 kilometers, reaching up to about 10,000 kilometers in altitude (the exosphere). However, the atmosphere becomes increasingly thinner and the air pressure decreases rapidly with increasing altitude. The boundary between the atmosphere and space is commonly defined as the Kármán line, which is approximately 100 kilometers above sea level.

Earth's Atmosphere Ends Quite Abruptly at an Altitude of 40