For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

The object gained an official name, C/2025 N1 or 3I/ATLAS, on Wednesday. Moving at a record-setting speed for an interstellar ...

A potential dwarf planet has been discovered in the outer reaches of our solar system, orbiting beyond Neptune. Its presence there challenges the existence of a hypothetical body known as Planet 9 ...

Our solar system is a particularly crowded place. Millions of objects move within it, whether they are planets, moons, comets, or asteroids. And every year, we discover more and more objects ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find ...

The dwarf planet is one of the fastest spinning objects in the solar system and is covered in crystallized water. Due to its fast spin, Haumea is shaped like an elongated potato or a deflated ...

All of the planets of the solar system are visible together in the night sky right now, providing stargazers with a "spectacular" show to end the year. Over the next few days, ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Don't worry though—it's not like one planet simply fell out of the solar system. We'll explain what happened and also show you some tricks for remembering the order of all of the planets that ...

Cheng said the discovery of 2017 OF201 has implications for hypotheses involving the potential existence of a ninth planet in our solar system, ... The Best Cartoons on Donald Trump. June 27, 2025 ...