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confused asked ·

Did the Big Bang make a bang?

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einstein answered ·
As sound is made up of wavelike changes in density, it’s impossible to hear anything in a true vacuum. Even so, the early Universe wasn’t a vacuum, being filled instead with hydrogen and ionized gas. The resulting sound of the Big Bang would be far too low-frequency to hear directly, but using real cosmic data and boosting the frequency, cosmologist Professor John Cramer of the University of Washington has simulated the sound, which can be heard at http://bit.ly/im0N.
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