Mystery of radio signal from space solved after 40 years
US-based researcher Antonio Paris has solved the 72-second radio signal from space recorded by an Observatory in 1977. As sources like asteroids, exoplanets, stars were ruled out, Prof Paris suggested the signal might have come from a comet. During 2016-17, some comets were discovered emitting similar signals, explaining the "mystery" which had prompted an astronomer to scribble "Wow!" back then.