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Well, the atmosphere goes all round the planet Earth and as the mean circumference 40,041.47 km that is how long the atmosphere must be.

However if you want to know how thick the atmosphere is, there is no definite boundary between the atmosphere and outer space, it just slowly becomes thinner and fades into space. The Kármán line, at 100 km (62 miles or 328,000 ft), is frequently regarded as the boundary between atmosphere and outer space.

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17y ago

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