Space is typically thought of as a very quiet place. But one team of astronomers has found a strange cosmic noise that booms six times louder than expected. The roar is from the distant cosmos. Nobody knows what causes it. The signal is measured to be six times brighter than the combined emission of all known radio sources in the universe. For now, the origin of the signal remains a mystery. "We really don't know what it is,"said team member Michael Seiffert of NASA's Jet Propulsion Laboratory in Pasadena, Calif.
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