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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: the earth has five atmospheres: troposphere, stratosphere, mesospere, thermosphere, and exosphere. the top of the exosphere is about 360 miles above the earth, once your out of this you are in outerspace, most people would consider 55000 feet (9 miles) to be space because you can see the curve of the earth and the sky is darker.