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

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 ...

A New Understanding of the Outer Solar System’s Structure The discovery of these distant objects, combined with the ...

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

There are also many in a region beyond Neptune called the Kuiper Belt. The solar system also contains small objects called comets. Comets are similar to asteroids, but are made of ice, dust and ...

But our own Solar System's disc is relatively warped, with the orbits of its planets slightly tilted and more oval than circular. What happened to it? It's possible a heavy object fell into the mix ...

The outer solar system is a fascinating region that includes a variety of celestial bodies, particularly trans-Neptunian objects (TNOs), which are located beyond the orbit of Neptune. Recent ...