In 1967, astronomers thought they had finally heard from the neighbors. They intercepted a signal so regular and precise it seemed impossible for it to be natural. But the excitement didn’t last.

In the search for extraterrestrial life, researchers have hinted at the idea that advanced alien civilizations may be communicating with each other using a series of flashing lights, similar to the ...

Humans should look to planetary alignments outside of the solar system when searching for signatures of extraterrestrial communications, scientists say. The nascent search for radio transmissions from ...