Shining in the constellation Gemini near the bright stars Pollux and Castor, Jupiter's opposition is the best time to see the ...

A four-planet system reveals remarkable insights about how planets form and how they change during their lifetime.

Now, a new Nature study points to an answer by catching four planets at a stage most systems never show us: The awkward, ...

The Hubble Space Telescope has captured a spectacular new image of the largest and most unusual protoplanetary disk ever ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

The upcoming year will offer a blood-red moon, spectacular meteor showers and the first glimpse of the sun’s corona since ...

With sapphire waterfalls, lava rain and orbits around dead stars, these distant worlds push the limits of what’s possible.

Jupiter, as always, is a dazzling object, shining among the stars of Gemini the Twins. It reaches opposition on Jan. 10; this ...

Now, according to new research published in Science, astronomers have managed to weigh a rogue planet for the first time. The ...

Choose your fighter for the origin of water on Earth! Was it always here or did it come to this planet from somewhere else in ...

Across the Milky Way, planets slightly larger than Earth but smaller than Neptune appear around most stars. Yet our own solar ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...