For more than a century, popular culture has trained us to picture extraterrestrials as bug-eyed, bipedal “little green men” ...

An illustration shows what exoplanet K2-18b might look like based on data from NASA's James Webb Space Telescope. K2-18b is 8.6 times as massive as Earth, orbits the cool dwarf star K2-18 in the ...

Discovering extraterrestrial life has tantalized the public imagination as far back as Epicurean philosophers in Ancient Greece. Yet despite centuries of speculation, the search for alien lifeforms ...

Historically, many scientists and society have been fascinated by the prospect of making contact with extraterrestrial ...

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 ...