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Key Facts In This Video
The ARCADE (Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission) balloon was launched to pick up radio signals in space. 00:24
The 2006 "space roar" was six times louder than the signals NASA was expecting to pick up. 00:57
Space is mostly a vacuum, so there is no physical medium for sound to move through. 02:11