Scientists find boundary between Earth and space for first time

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Andrea Thompson

Hold on to your hats, or in this case, your helmets: Scientists have finally pinpointed the so-called edge of space — the boundary between Earth's atmosphere and outer space.

With data from a new instrument developed by scientists at the University of Calgary, scientists confirmed that space begins 73 miles (118 kilometers) above Earth's surface.

A lot remains very fuzzy, however, as the boundary is surrounded by a host of misconceptions and confusing, conflicting definitions.

For starters, astronauts can say they've been to space after only passing the 50-mile (80-kilometer) mark.

Meanwhile the boundary recognized by many in the space industry is also a somewhat arbitrary 62 miles (100 kilometers). Scientist Theodore von Kármán long ago calculated that at this altitude the atmosphere is so thin that it's negligible, and conventional aircraft can no longer function because they can't go fast enough to get any kind of aerodynamic lift. This 62-mile boundary is accepted by the Federation Aeronautique Internationale (FAI), which sets aeronautical standards.

The United States, however, has never officially adopted a set boundary standard because it would complicate the issue of overflight rights of satellites and other orbiting bodies, according to NASA.

http://news.yahoo.com/s/space/20090409/sc_...dgeofspacefound

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[Desi_munda 0]

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