Loud sounds tend to startle us. But imagine being surprised by a sound six times louder than you expect. A balloon-borne instrument called ARCADE, (Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission) was supposed to be used to search for heat signature from the first stars to form after the Big Bang.
Instead it found an unexplained "booming" radio static that fills the sky. (read more)
Instead it found an unexplained "booming" radio static that fills the sky. (read more)
The balloon-borne ARCADE instrument discovered this cosmic static (white band, top) on its July 2006 flight. The noise is six times louder than expected. Astronomers have no idea why. Credit: NASA/ARCADE/Roen Kelly
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