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

From breathtaking views of asteroids to stunning planetary snapshots, Hubble’s exploration of our solar system has been nothing ... Powerful images from the front lines of the LA wildfires ...

First we are going to make the stars in our solar system. For this you need to dip a dry paintbrush in to white paint, and using your finger, flick the paintbrush, so that the paint goes all over ...

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 ...

The BepiColombo spacecraft has sent back some incredibly detailed images of Mercury’s north pole. The snapshots were collected during its closest ever flyby of our solar system’s smallest planet.

This may explain the strange properties of the orbits of our solar system's planets ... More NASA, ESA, Caltech / ISTOCK / GETTY IMAGES PLUS "[T]he puzzle for theoretical astrophysics has long ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

This mysterious ninth planet could be found within the next ‘two years’, one expert said (Picture: Getty Images/iStockphoto) We’re closer than ever before to knowing whether there is a ninth ...

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