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

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.

An artist’s rendering of the IMAP spacecraft, which will explore and chart the boundaries of the ...

The spacecraft will study the solar system's edge, magnetic fields in interplanetary space, and remnants of exploded stars.

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 ...

The rate of finding these distant worlds has recently increased, with astronomers scrambling to accommodate the data ...