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Gravitational Waves and Cosmology

Is this ET? Mystery of strange radio bursts from space

Mysterious radio wave flashes from far outside the galaxy are proving tough for astronomers to explain. Is it pulsars? A spy satellite? Or an alien message?

https://www.newscientist.com/article/mg22630153-600-is-this-et-mystery-of-strange-radio-bursts-from-space/