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A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But not everyone agrees that it signals life. An illustration shows what ...

Here’s what you’ll learn when you read this story: The Search for Extraterrestrial Intelligence (SETI) focuses on finding technosignatures—potential signs of alien technology. If we look carefully, we ...

The questions of whether we are alone in the universe is one at the heart of sci-fi. The question of who we are if we are not solely God’s creatures... does that mean there’s no God? Only lonely ...