The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Earth is home to some truly bizarre and breathtaking landscapes — here are 20 that look straight out of an alien world.

Research on hidden structures deep within Earth’s mantle challenges theories about our planet’s middle layer and could ...

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Astronomers have discovered a large Earth-like planet orbiting a distant star that could be home to alien life. The exoplanet ...

Four planets will be in the parade in January, while seven will align in February. Here's how to see the events.

"This agreement represents a significant milestone for Planet; it is our largest contract to date and is a major step forward ...

How's your knowledge of Earth's geology? Flat, round or global?

Earth,” dubbed HD 20794 d, boasts a mass six times that of our planet and resides within the star’s “habitable zone.” The ...

Venus and Saturn will set about three hours after sunset.Venus and Saturn are currently in conjunction, meaning the planets ...

Astronomers discovered supersonic winds on a giant gas planet located over 500 light-years from Earth. In a study released ...