We usually think of our Solar System as a calm, well-organized family of planets, but a new study suggests its early days may ...

The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...

In 1995, scientists made a revolutionary find with the discovery of 51 Pegasi b, a massive exoplanet in a tight orbit around ...

Our solar system may have hosted up to six giant planets in its first hundred million years, a new study suggests. The ...

Looking at the Solar System, Jupiter and Uranus both have plenty of irregular moons. In supercomputer simulations, the ...

The Sun is an incandescent but benevolent dictator. For billions of years, it’s kept our star system well organized through the influence of its powerful gravity. All the planets revolve around it on ...

Jupiter, Saturn, Uranus and Neptune did not always have their current positions in the solar system. According to the ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course. When ...

Nearly a decade after astronomers first proposed that a massive, unseen world is warping the paths of the most distant known ...

As it turns out, the conditions that set Venus and Jupiter up for their conjunctions in the sky are the same that are ...

Studying the orbits of thousands of exoplanets shows that large planets tend to have elliptical orbits, while smaller planets tend to have more circular orbits. This split coincides with several other ...