A Harvard University astrophysicist has sparked a furious debate by warning he cannot rule out that extraterrestrials are ...

Today is one astronomers, stargazers and alien conspiracy theorists have been waiting for: interstellar comet 3I/ATLAS is as ...

Aliens might be transmitting communications signals to each other across exoplanets, some astronomers think. Since these signals are likely sent as narrowband radio waves, we may now have a way to ...

Far beyond the reach of any probe, astronomers have found a gas giant whose atmosphere behaves less like a familiar planet and more like a special effect from a big-budget space epic. Orbiting a ...

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 ...

Recent observations suggest that scientists have identified potential microbial fingerprints in the atmospheres of other planets, raising intriguing questions about the possibility of alien life ...