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Have We Detected Megastructures Built By Aliens Around A Distant Star? | Popular Science
In a recent paper, researchers have ruled out the possibility of faulty data or telescope jostling. Something appears to be blocking out the light, but it's not a planet, and the star is too old to be surrounded by the rings of debris that tend to circle around younger stars. Neither do the scientists think it could be caused by a recent collision.
That leaves just a few hypotheses. One is a cloud of comets that got pulled into orbit by a migrating star--if the comets are breaking up as they revolve around the star, that could cause the irregular pattern of dimming. The paper notes that this is the most promising explanation.
There is one other hypothesis, however.
“Aliens should always be the very last hypothesis you consider," Penn State astronomer Jason Wright told The Atlantic, "but this looked like something you would expect an alien civilization to build.”