Could alien signals have already reached Earth undetected?

Could alien signals have already reached Earth undetected? - If advanced alien civilisations exist and have contacted Earth, ...

If alien signals have already reached Earth, why haven't we seen them?

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp question: if alien signals have already reached Earth without us noticing, what ...
来自MSN

Alien-hunters crack cosmic code with new 'twinkle test' that spot real space signals

Boffins at the SETI (Search for Extraterrestrial Intelligence) Institute have found a new way to sort through the signals reaching us from space to find messages from aliens. By pointing their ...
Insane Curiosity on MSN

The first signal from space was a dog’s heartbeat

The first “signal from space” wasn’t aliens—it was a dog’s heartbeat. In November 1957, Laika orbited Earth every 104 minutes ...