An animation posted to Twitter has shocked social media users by showing the impressive size of Jupiter and just how rapidly the solar system's largest planet rotates. The animation posted by ...

Astronomers studying extreme planetary systems have identified worlds so massive that they rival the smallest stars in size.

Astronomers have discovered a planet the size of Jupiter orbiting a star that’s only half the size of the sun — a celestial phenomenon that contradicts theories of planet formation. NGTS-1b, a massive ...

Want to know how the Millennium Falcon compares in size to an Imperial Star Destroyer? Just watch a Star Wars movie. But if you want to know how that hunk of junk compares to the Battlestar Galactica, ...

During its 4.5-billion-year life span, Earth’s been hit by countless asteroids. (Despite Jupiter’s noble attempts at defending it.) But while it’s easy to imagine the damage they’ve done, just how big ...

Astronomers have detected what may be four roughly Earth-size planets orbiting Tau Ceti, the nearest sun-like star. Two of the worlds appear to orbit within Tau Ceti's habitable zone, though a cloud ...

FLORIDA: Astronomers have found a nearby solar system with seven Earth-sized planets, three of which circle their parent star at the right distance for liquid surface water, bolstering the prospect of ...

Editor's Note: Learn more about the announcement of the first Earth-size alien planets found in our story here. For life as we know it to arise on another planet, scientists think the alien world must ...