100 KM.=62 Mi.=327,360 FT.
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The atmosphere can extend up to about 10,000 km above Earth's surface, but the density of air decreases significantly as you move higher. The exosphere, the outermost layer of Earth's atmosphere, is where the atmosphere transitions into space.
The Earth's atmosphere extends about 480 km (300 miles) from the surface, but the majority of its mass is concentrated within the first 16 km (10 miles), known as the troposphere. Beyond the atmosphere lies outer space.
The outermost part of Earth's atmosphere is the exosphere, which extends from about 500 km to 10,000 km above the surface. Satellites in geostationary orbit, located at an altitude of about 35,786 km, are still within Earth's exosphere.
The boundary between the Earth's atmosphere and outer space, known as the Kármán line, is located approximately 62 miles (100 kilometers) above the Earth's surface. This is where the atmosphere becomes too thin to support conventional aircraft flight.
It is 362,570 km (0.0024 AU) away from the Earth
The layer of the atmosphere that is approximately 550 km to 1000 km above Earth's surface is the exosphere. This region is the outermost layer of the atmosphere where the gases are very thin and the few particles present can escape into space. The exosphere is where the atmosphere merges with outer space.