Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

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

While most models of solar system formation predict perfectly circular and coplanar orbits for the planets, reality presents a slightly different picture. Successful Simulations: Approximately 1% ...

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

Despite common assumptions, the disk of our Solar System is warped, and the planets travel around the Sun in slightly eccentric (or oblong) orbits. Scientists now think that a mysterious object ...

This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

with highly “tilted” orbits compared to the ecliptic plane. This seemed odd and illogical as when the Solar system formed, it would be expected that objects that developed in the circumstellar ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The discovery of the exoplanet, which orbits a star outside the solar system, challenges how experts classify planets and transforms our understanding of planetary formation. Astronomers have ...

Most comets have elliptical orbits that bring them close to the Sun and then far out into the solar system. Some have long-period orbits taking thousands of years, while others are short-period ...