It must have cleared all other celestial bodies, except its own moons, from its orbit.

New research explores if the moon was captured by Earth or formed by a collision. Scientists weigh theories, analyzing lunar ...

A team combined compositional data of primitive bodies like Kuiper Belt objects, asteroids and comets with new solar data sets to develop a revised solar composition that potentially reconciles ...

Astronomers have been curious about the makeup of Ceres, the largest object in the asteroid belt, ever since its discovery by ...

Researchers at Penn State University suggest that Earth’s only satellite may have come from a “binary-exchange capture” ...

Current theories suggest that Triton was pulled into Neptune from the Kuiper Belt where one in 10 objects are thought to be a ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

For nearly 40 years, scientists have generally agreed that Earth's Moon formed from debris after a massive collision with our ...

Scientists recently detected carbon dioxide and hydrogen peroxide on the frozen surface of Charon, Pluto's largest moon. The researchers conducted the survey using the James Webb ...