 | | | | | | | | | | |  |  | | | | Science: 'Big Bang was just a deep hum'">Archive of stories pre April 2007 | | | | | | | 
Archive of stories pre April 2007 | News submitted by: MIB
Scientists say the universe began with a deep hum rather than a Big Bang.
An analysis of radiation left over from the dawn of creation has been used to create audio files which can be played on a computer.
Physicist John Cramer, from the University of Washington in Seattle, said: "The sound is rather like a large jet plane flying 100 feet above your house in the middle of the night."
He was prompted to carry out the research by an 11-year-old boy who wanted to know what the Big Bang sounded like for a school project.
Just after the Big Bang about 14 billion years ago, giant sound waves rippled through the blazing hot matter that filled the universe.
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 Big Bang afterglow. Scientists call it the cosmic microwave background.
Cramer reproduced the sound using data from Nasa's Wilkinson Microwave Anisotropy Probe, New Scientist magazine reported.
The fluctuations enabled Cramer to calculate the frequencies of the sound waves propagating through the universe during its first 760,000 years.
At that time, when the universe was just 18 million light years across, the sound waves were too low in frequency to be audible.
To hear them, Cramer had to scale up the frequencies 100,000 billion times.
http://www.ananova.com/news/story/sm_833519.html?menu=news.scienceanddiscovery
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