The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

The Carnegie Institution for Science and the International Astronomical Union’s Minor Planet Center has announced the discovery of dwarf planet ... For comparison, Earth orbits 1 AU (93 million ...

While Charon is currently listed as a satellite or moon by the International Astronomical Union (IAU), consideration is being given to it perhaps being classified as a dwarf planet in its own right, ...

While Pluto was demoted to dwarf planet status in 2006 ... on extremely elongated orbits that stay far away from Neptune, and ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Charon is the largest moon of the dwarf planet Pluto, but calling it a moon is really a misnomer; Pluto and Charon actually form a binary system. Whereas a moon usually orbits a planet ...

But once more objects were found to share similar orbits with Ceres ... Then there are "minor planets," which include the ...

The planet, called Barnard’s b, orbits Barnard’s star ... Barnard’s star is a red dwarf star, a low-mass, cool star that comprises about 70% of all the stars in the Milky Way.