The president in February directed the Department of Defense to begin reviewing government files related to extraterrestrial ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

A single alien world can be misleading. A strange gas in an atmosphere might look promising, then turn out to come from ...

Usually, comets are dormant blocks of rock and ice. They only wake up when they get close to a star. The intense heat causes ...

Aristotle believed the planets revolved around Earth and God could not have created other worlds. Today, scientists scour the ...

Two Earth-sized planets orbiting TRAPPIST-1 are locked in permanent day and night, with heat differences suggesting they are ...

A research team has developed a new approach to detecting life beyond Earth that does not rely on identifying specific ...

A new study proposes detecting life in space by spotting patterns across many planets instead of focusing on one at a time.

From lava tubes on Mars to ice pockets on Europa, subterranean environments may offer the best chance of finding life—and living safely—beyond our planet. “I was like, ‘OK, I'm pretty sure that ...

In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

Using NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new "hot ...

These findings suggest that the absence of past detections does not mean discovery is imminent. If extraterrestrial technologies exist and have already sent signals that reached Earth, they are likely ...