This is a photo of a Space Shuttle Main Engine being tested here at Marshall Space Flight Center. I recall the days of working in building 4666. We could step out behind the building and be about 300 yards from the test stand. You'd see the igniter light, but it would take a handful of seconds before the sound got to you, and the pressure wave. You could see the pressure wave traveling as it pushed aside the bushes and long grass and then...wow, it would hit you square in the chest. The roar of power owned your ears...no point trying to converse. The engine demanded your attention until the flash of the lights at engine level signaling that the cut-off signal had been given. Then the roar died off into answering echoes, and you could hear...a bit muted for a while. Wow
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