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.

Astronomers anticipate an unprecedented view of the solar system as the Rubin Observatory begins to scan millions of hidden ...

How big it is: 865,000 miles (1.392 million kilometers) across ...

Based on 20 years of observations by NASA’s Hubble Space Telescope, new research sheds light on one of the solar system’s ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

For instance, Neptune migrated outward, switching places with Uranus, and pushed a lot of the small, icy bodies into the ...

A group of astronomers from across the globe, led by Queen’s University Belfast, have revealed that millions of new solar system objects will be detected by a brand-new facility, which is expected to ...

Many scientists refer to Jupiter as the "architect" of the solar system because its immense ... had to have been to match that rotation. The size of a young planet sheds light on its heat and ...

New research suggests that Jupiter, the largest planet in our solar system, was once even bigger—about twice its current size—and had a magnetic field 50 times stronger than it does today. This ...