Could alien signals have already reached Earth undetected?

Astronomers have searched the skies for signs of extraterrestrial technology for decades. These searchers since 1960 have ...
The Daily Galaxy on MSN

Alien signals could have already reached us: Why haven’t we detected them?

For decades, scientists have been actively searching for signs of extraterrestrial life. Fromradio waves to laser flashes and ...
Knowridge Science Report

If aliens already called, why didn’t we hear?

For more than 60 years, scientists have been scanning the skies for signs of intelligent life beyond Earth. Using powerful telescopes, they have searched for unusual radio signals, brief laser flashes ...