It sounds like the 13,000 miles per hour (around 5.8 km/s) speed is only during
the suborbital part of the flight, with impact speeds a much more believable
mere 3,600 miles per hour (around 1.6 km/s.)
http://www.foxnews.com/scitech/2010/04/26/falcon-hypersonic-missiles-project-aurora/
--- On Mon, 4/26/10, Darren Garrison cyna...@charter.net wrote:
On the heels of the top-secret X37-B launch, the U.S. Air
Force launched an even
more secret experimental hypersonic glider able to travel
more than 4,000 miles
in 30 minutes from launch. The craft -- dubbed the Falcon
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