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

NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth. The ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known as a ...

Mercury takes only 88 Earth days to orbit the sun.

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

Stargazers will be treated to a dazzling six-planet "alignment" this January.

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

The solar system consists of stars, the Sun, 8 planets, dozens of moons, millions of asteroids, comets, and meteoroids. It orbits the centre of the Milky Way galaxy at about 515,000 mph.

The exoplanet has a radius around 2.7 times and a mass about 8.2 times greater than Earth ... expands our understanding of the diversity of planets (just like this strange object in our Solar System).

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.