Virgin Galactic gets its passengers high enough to count as "space". To get into orbit (or beyond) requires the craft to reach escape velocity (I think about 18,000mph), a much more difficult task. Usually involving multi-stage rockets.Virgin Galactic is a prime example of the progress being made.
Also...Wikipedia "Atmosphere" said:The atmospheric composition on Earth is largely governed by the by-products of the very life that it sustains. Earth's atmosphere contains roughly (by molar content/volume) 78.09% nitrogen, 20.95% oxygen, a variable amount (average around 0.247%, National Center for Atmospheric Research) water vapor, 0.93% argon, 0.038% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases.
I don't know when they got it, but I know Purdue had a super (possibly hyper??) sonic wind tunnel.
by Duane Benson
by Jeff Child
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