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Great question. The Earth's atmosphere just gets thinner and thinner so there is no sharp dividing line. Years ago the US defined it as 50 miles. The Europeans defined it as 100 km (62.1 miles). The 100 km limit is now more widely used. Using a rocket-mounted ion detector, scientists recently pinpointed the boundary between Earth's atmosphere and Outer Space which turns out to be: 73.3 miles up (387 024 feet).

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15y ago

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