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.

The mysteries of the cosmos continue to unravel, with scientists piecing together clues about the origins of our solar system. Among these revelations, polycyclic aromatic hydrocarbons (PAHs) stand ...

Late in the evening on July 1, a telescope in Chile that is part of the global, NASA-funded Asteroid Terrestrial-Impact Last Alert System (ATLAS) picked up on a new moving dot in the sky, an object ...

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 ...

Scientists have unlocked one of the solar system’s many secrets from an unexpected source: a planetarium show opening to the public on Monday. At the American Museum of Natural History last fall, ...

Astronomers from the University of Arizona helped detect a baby planet outside of our solar system. Specialized telescopes from Arizona and Chile contributed to the discovery.

On May 21, the International Astronomical Union’s Minor Planet Center announced the discovery of 2017 OF 201, which, because of its distance beyond Neptune, is classified as a trans-Neptunian object ...