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Currently you are able to watch "Wow Signal" streaming on Peacock or for free with ads on VUDU Free, Tubi TV, Redbox, Freevee, DistroTV. It is also possible to rent "Wow Signal" on Amazon Video, Vudu, Apple TV, Google Play Movies, YouTube online and to download it on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu.
On a late summer evening in 1977, Ohio radio astronomers discovered a strong, interstellar signal that is believed by many to be the best evidence of communication from an extraterrestrial civilization.