Wednesday, April 18, 2007

Did you know...

Outer Space
There is no clear, definable line between where the Earth's atmosphere ends and outer space begins. However, an altitude known as the Karman Line -- 100 km or 62 miles -- is often used to distinguish between atmosphere and space, since this is the distance where a vehicle would need to reach a speed faster than the Earth's orbital velocity to leave its atmosphere.

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