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Space roar
The space roar is a radio signal from outer space. Discovered by NASA's Alan Kogut and his team, space roar was announced at the 213th meeting of the American Astronomical Society on January 7, 2009. Described as a loud hiss, the team discovered the signal while trying to find traces of heat from first generation stars using an ARCADE radiometer.〔 This instrument is designed to detect radiation at centimeter wavelengths. Though signals from radio galaxies have been detected before, the "space roar" sounds six times louder than what is predicted from those sources. Scientists have yet to explain its source.〔 NASA scientists have currently ruled out primordial stars and all other known radio sources. The roar currently limits the study of the universe's earliest stars.〔
==Equipment error as possible explanation==
In 2011, the ARCADE 2 researchers reported, "Correcting for instrumental systematic errors in measurements such as ARCADE 2 is always a primary concern. We emphasize that we detect residual emission at 3 GHz with the ARCADE 2 data, but the result is also independently detected by a combination of low-frequency data and FIRAS."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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