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 ...

Image an alien planet where savage winds rip through the atmosphere carrying molten iron and titanium particles. Such a planet actually exists. Known as WASP-121b, this exoplanet is located 900 ...

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 ...

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 ...