A team of Russian researchers recently reported picking up a message from space.
Unfortunately, even scientists from the Search for Extraterrestrial Intelligence (SETI) say it probably wasn't ET.
They believe the signal probably had an Earthly cause: a satellite, a stellar flare, a software glitch or any number of far more likely scenarios.
The three-second signal burst came from 94 light years away, in the HD 164595 star system. To broadcast that kind of signal would have taken a lot of energy - hundreds of times more energy than all the sunlight falling on the Earth.
Also, the Russian scientists took over a year to report it, so there was no possible confirmation or a follow-up detection.
Still, some have compared it to 1977's famous "Wow!" signal.
Back then a US radio telescope detected a 72-second transmission from space.
They still don't know what produced it and, despite repeated attempts, it was never detected again.