A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

Emily Simpson has loved space since she was a 10-year-old kid celebrating her birthday at a planetarium. Now a recent Florida Tech graduate, she leaves with not only a dual degree in planetary science ...

The Kuiper Belt could extend billions of miles farther than anyone thought. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. NASA's New Horizons ...

A possible new dwarf planet described as "Pluto's cousin" has been found at the edge of the solar system, so far away that it takes around 25,000 years to complete one orbit around the Sun.

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...

This is an image of Ceres, the nearest dwarf planet to Earth in the solar system. A new dwarf planet extremely far from the sun may have just been discovered. Credit: NASA / JPL-Caltech / UCLA / MPS / ...

Scientists were able to see the moment when planets began to form around a star. Astronomers have witnessed the birth of a solar system beyond our own for the first time. An international team of ...