In 2006, NASA stumbled across a source of radio waves with six times the intensity of any other source ever measured. In fact, alone it produced a more intense radio signal than all the stars and galaxies in the entire universe put together. So what the hell was it?
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Now known as The Space Roar, the radio emissions remain somewhat of a mystery—but this video by Sci Show rounds up everything we known about it at the moment. Including why, oddly, we can't really hear it. [Sci Show]