# How Far up Is Space?

The Earth is surrounded by a blanket of air, which we call the atmosphere. It reaches over 560 kilometres (348 miles) from the surface of the Earth, where space starts at the exosphere above the thermosphere. Space begins at a somewhat arbitrary line 62.137 miles (100 kilometres) above the earth’s surface.
Space is everywhere that matter is not. Outer space does not have a clear boundary because the atmosphere does not stop at a line, but rather it tapers off very slowly. Some people say 62 miles up is the boundary, but in the USA anybody who flies above 50 miles is called an astronaut. You can find more information here: http://en.wikipedia.org/wiki/Outer_space
Space is about as far away as our atmosphere is thick. So, this means that space is about 800 miles away. This is actually an estimated number, because our atmosphere phases out until it blends into space.
Q&A Related to "How Far up Is Space"
 It's not very far to get to space, as it's only about 220 miles above the earth's surface. Scientists call the float line for a spaceship the Karman line, and have designate it to http://answers.ask.com/Science/Other/how_far_is_it...
 When installing batts or rolls of insulation below a floor or in a ceiling above, using insulation supports is a good idea. The standard suggestion is 36 inches apart. The wire supports http://www.ehow.com/decision_7298065_far-insulatio...
 When installing batts or rolls of insulation below a floor or in a ceiling above, using insulation supports is a good idea. The standard suggestion is 36 inches apart. The wire supports http://www.ask.com/question/how-far-apart-are-the-...
 Answer Space goes on for trillions and billions of kilometres and miles and is still expanding this very minute! http://wiki.answers.com/Q/How+far+is+the+deepest+s...
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