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Roar from Deep Space
The roar is from the distant cosmos. Nobody knows what causes it.
Of course, sound waves can't travel in a vacuum (which is what most of space is), or at least they can't very efficiently. But radio waves can.
Radio waves are not sound waves, but they are still electromagnetic waves, situated on the low-frequency end of the light spectrum.
Many objects in the universe, including stars and quasars, emit radio waves. Even our home galaxy, the Milky Way, emits a static hiss (first detected in 1931 by physicist Karl Jansky). Other galaxies also send out a background radio hiss.
But the newly detected signal, described here today at the 213th meeting of the American Astronomical Society, is far louder than astronomers expected.
There is "something new and interesting going on in the universe," said Alan Kogut of NASA's Goddard Space Flight Center in Greenbelt, Md.
© 2009 space.com
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