Many experts believe that aliens exist in the universe, with the key elements needed to sustain life found on comets, ...

The research is mounting up that we might not be alone in this big wide world. So what's the likelihood that aliens are out ...

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 ...

The Search for Extraterrestrial Intelligence (SETI) focuses on finding technosignatures—potential signs of alien technology. If we look carefully, we might have a chance at detecting their ...

What makes a being sentient? It’s an incredibly tricky question, one that has vexed philosophers (and science-fiction writers) for generations. And before Alien: Earth, it’s a question raised mainly ...