Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

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 ...

In 1995, a pair of scientists discovered a planet outside our solar system orbiting a solar-type star. Since that finding—which won the scientists a portion of the 2019 Nobel Prize in ...

For more than 70 years, the image of the Grey alien has haunted human imagination. Oversized black eyes. Smooth grey skin. A ...