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Wind tunnels have been part of aviation research since before the first powered aircraft took to the skies. And there are a huge range of capabilities available to researchers, including the ability to test models are mach numbers close to orbital velocity.
I discovered the thumbnail image on a NASA page showing a Mach 20 helium wind tunnel testing a model of the Space Shuttle Orbiter and thought it was worth explaining how all this comes together to create the image.
www.nasa.gov/m...
If you want to read more about the evolution of wind tunnels there's a book which primarily covers NASA's (and NACA's) wind tunnels
history.nasa.g...
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