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SEATTLE, WASHINGTON, October 30, 2003: The Big Bang sounded more like a deep hum (“aum,” perhaps?) than a bang, according to an analysis of the radiation left over from the cataclysm. Physicist John Cramer of the University of Washington in Seattle has created audio files of the event which can be played on a PC (download at “source” above). “The sound is rather like a large jet plane flying 100 feet above your house in the middle of the night,” he says. Giant sound waves propagated through the blazing hot matter that filled the universe shortly after the Big Bang. These squeezed and stretched matter, heating the compressed regions and cooling the rarefied ones. Even though the universe has been expanding and cooling ever since, the sound waves have left their imprint as temperature variations on the afterglow of the big bang fireball, the so-called cosmic microwave background. Cramer was prompted to recreate the din last heard 13.7 billion years ago by an 11-year-old boy who wanted to know what the Big Bang sounded like for a school project.

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