"It was just a matter of time before we found them." ...

This illustration shows the alien planet around pulsar PSR J1719-1438, where ultra-high pressures caused carbon to crystallize in the remnant of a dead star. The planet is made of diamond and orbits a ...

Thirty years ago this week, two Swiss astronomers announced that they had spotted the first known planet orbiting a Sun-like star. The Nobel-winning discovery, later published in the pages of Nature, ...

Is anybody out there? Probably. Most stars have planets; we've discovered more than 6,000 exoplanets thus far, and the most ...

Astronomers using the James Webb Space Telescope (JWST) have identified what they describe as the most compelling evidence so far for biological activity beyond Earth. The findings focus on the ...

An alien comet passing through our solar system made its closest approach to Mars recently, and two European robotic ...

Alien solar systems that are home to so-called "hot Jupiters" — gas giants circling sizzlingly close to their stars — are unlikely homes for Earth-like planets, researchers say. Hot Jupiters get their ...

SEATTLE – NASA has discovered the smallest planet ever seen beyond our solar system – a rocky world just 1.4 times larger than Earth – using its planet-hunting Kepler observatory. The planet, called ...