The edge of space

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wolram
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http://www.sciencedaily.com/releases/2009/04/090409142301.htm

Where does space begin? Scientists at the University of Calgary have created a new instrument that is able to track the transition between the relatively gentle winds of Earth's atmosphere and the more violent flows of charged particles in space – flows that can reach speeds well over 1000 km/hr. And they have accomplished this in unprecedented detail.
 

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With that data, U of C scientists confirmed that space begins 118 km above Earth and the results were published this week in the Journal of Geophysical Research.


So, the X-15 never really make it to outer space.
 

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