Astronomers may have found giant alien 'megastructures' orbiting star near the Milky

[Bear]

There are a whole lot of "repeating signals" out there that have nothing to do with any kind of intelligence. Pulsars, Magnetars, masses in tight orbit around neutron stars or black holes, etc. All produce electromagnetic radiation in a repeating pattern. The "rescinded" thing is really only about his mistake in using the word "signal" to refer to them in front of a journalist, because a journalist doesn't know any better than thinking the word "signal" implies "intentional communication from some other civilization."