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Winged death machines, flat-tops, dreadnoughts, grey wolves, sharks of steel, nuclear weapons and a dab of space related content from time to time.

Schlieren photographs taken by NASA at Edwards AFB using the Ground-to-Air Schlieren Photography System (GASPS), capture the shockwaves created by supersonic jets.

First picture: F-15B at Mach 1.2 and 40,000ft

Second picture: F/A-18B at Mach 1.1 and 44,000ft

Third picture: F-15B at Mach 1.38 and 44,000ft

(Source and more info)