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

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

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 ...

People around the world will have a chance this weekend to catch what could be the year’s most stunning view of the largest planet in our solar system ... of Canis Minor and Betelgeuse in ...

For much of January and February, you have the chance to see six planets in our solar system after dark ... making it appear at its biggest and brightest." ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But ...

When astronomers realized that Ceres had many "relatives" in roughly the same region of the solar system, they began calling them asteroids or minor ... the biggest ones to the list of planets.

The eight major planets of our Solar System orbit the Sun in the same flat ... rhythms can improve how quickly we learn. The world's largest invertebrate remained hidden from humanity until ...