In 1977, astronomers received a powerful, peculiar radio signal from the direction of the constellation Sagittarius. Its frequency was the same as neutral hydrogen, and astronomers had speculated that ...

For researchers seeking answers to the question of whether we are alone in the universe, one event nearly half a century ago lingers even today — the so-called "Wow! Signal" detected back in 1977.

One late night in the summer of 1977, a large radio telescope near Delaware, Ohio, captured something that, for a fleeting ...

As far as interesting problems go, few can really compete with the perennial question: “Are we alone?” The need to know if there are other forms of intelligent life out there in the galaxy is deeply ...