Assuming intelligent aliens know how to harvest energy from stars, would humanity be able to spot these high-level structures ...

Human intelligence wasn’t a cosmic evolutionary fluke, some scientists say. The case against cosmic loneliness is growing.

A provocative theory circulating among artificial intelligence researchers suggests that once machines achieve human-level intelligence and beyond, they might create something entirely unexpected: a ...

Bring up aliens and a lot of people will scoff. But not everyone is laughing. Around the turn of the century, 3.8 million people banded together in a real-time search for aliens -- with screensavers.

A recent theory proposed by a NASA scientist suggests that extraterrestrial civilizations may not possess the wildly advanced technology that many UFO enthusiasts expect. This perspective, which ...

But the real truth is that alien life on other planets could be even stranger than floating balloons or amorphous organisms floating in layers in water. Here on Earth, we have carbon-based life forms, ...

Add Yahoo as a preferred source to see more of our stories on Google. In his classic science fiction novel Contact, Carl Sagan remarked, “The universe is a pretty big place. If it's just us, seems ...

A new study suggests a novel approach in the long-running scientific endeavor to find intelligent life beyond Earth. Instead of casting a wide, speculative net across the cosmos, researchers from Penn ...

Editor's note: The below contains spoilers for Alien: Earth Episodes 1 & 2. The Alien franchise has always been focused on the race for immortality, and Noah Hawley's perfect organism, the FX original ...