Famous 'Alien' Wow! Signal May Have Come From Distant, Sunlike Star

Researchers may have pinpointed the source of a famous supposed alien broadcast discovered nearly a half century ago. Space.com reports: The prominent and still-mysterious Wow! Signal, which briefly blared in a radio telescope the night of Aug. 15, 1977, may have come from a sun-like star located 1,800 light-years away in the constellation Sagittarius. "The Wow! Signal is considered the best SETI (or the search for extraterrestrial intelligence) candidate radio signal that we have picked up with our telescopes," Alberto Caballero, an amateur astronomer, told Live Science. [...] The Wow! Signal most likely came from some kind of natural event and not aliens, Caballero told Live Science, though astronomers have ruled out a few possible origins like a passing comet. Still, Caballero noted that in our infrequent attempts to say hello to E.T., humans have mostly produced one-time broadcasts, such as the Arecibo message sent toward the globular star cluster M13 in 1974. The Wow! Signal may have been something similar, he added. Knowing that the Big Ear telescope's two receivers were pointing in the direction of the constellation Sagittarius on the night of the Wow! Signal, Caballero decided to search through a catalog of stars from the European Space Agency's Gaia satellite to look for possible candidates. "I found specifically one sun-like star," he said, an object designated 2MASS 19281982-2640123 about 1,800 light-years away that has a temperature, diameter and luminosity almost identical to our own stellar companion. Caballero's findings appeared May 6 in the International Journal of Astrobiology. "I think this is perfectly worth doing because we want to point our instruments in the direction of things we think are interesting," Rebecca Charbonneau, a historian who studies SETI at the Harvard-Smithsonian Center for Astrophysics and who wasn't involved in the work, told Live Science. "There are billions of stars in the galaxy, and we have to figure out some way to narrow them down," she added. But she wonders if looking for only sun-like stars is too limiting. "Why not just look at a bunch of stars?" she asked.

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