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 ...

Michigan State University and NASA researchers discover seven dark comets that reveal new solar system secrets.

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

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 Venus is the closest planet to Earth, one step inward in orbit around the sun. It's sky's brightest planet and 3rd brightest object ...

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 ...

The Kuiper Belt, a vast region of icy objects ... solar system’s formation, extends far beyond Neptune and is home to Pluto and other dwarf planets. Astronomers believe that Planet Nine could be ...