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The Karman line, at 100 km (62 miles), is also frequently used as the boundary between atmosphere and outer space. For all intents and purposes, space starts at about 62 miles. And no, it has absolutely zero to due with the Earth's gravity.
Best Answer: NASA says 62 miles (100 km) is where space starts. If you go that high, you're an astronaut. It's arbitrary. The atmosphere doesn't end. It just gets thinner and thinner. Some people talk about Earth's atmosphere at 700 or 800 miles.