Barnard’s Star hosts four hostile small planets whose unusual chemistry and orbital rhythm reveal how compact planetary systems can form and survive.

Our solar system is home to a whopping 891 moons, but the rest of the known cosmos? Nothing. Until now.  As a new paper in ...

Scientists are documenting a planetary system in the Milky Way galaxy that is so starkly dissimilar to our own solar system that they are struggling to find ​the proper terminology to describe it.

Astronomers have discovered a rare planetary system 71 light-years away, where a Jupiter-sized world orbits a brown dwarf, ...

Two giant planets lighter than cotton candy are giving astronomers a rare new window into the origins of some of the galaxy's strangest worlds.

On August 12, 2026, lucky viewers in and around Greenland, Iceland and Spain—weather allowing—will be able to see one of ...

Astronomers have identified a potentially habitable exoplanet just 25 light-years away, raising hopes that one of Earth's closest cosmic neighbours could eventually offer clues about life beyond our ...

A Jupiter-size exoplanet orbiting a dead star baffled astronomers. But the planet named WD 1856 b could preview the fate of our own solar system when the sun dies.

Our definition of a planet has changed over the years — causing a bit of confusion. | Credit: wasan prunglampoo/Getty Images Over the past 250 years, the number of "planets" in our solar system has ...

Jupiter is the most massive planet in our solar system, a gas giant with a surface area of 23.71 billion square miles (61.42 billion square km), and also the heaviest of them all, coming in at 318 ...

A pair of sibling gas giants originally spotted by citizen scientists are so lightweight that their density resembles wispy cotton candy more than a standard atmosphere. The rare duo detailed today in ...