Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home.

Earth Day is April 22 — think you know the planets? Test your knowledge of the solar system in this fun and engaging lifestyle quiz — and see how well you do!

Dwarf planets are worlds too small to be full-fledged planets, but too big to fit in smaller astronomical categories. Pluto, the most famous dwarf planet, lost its planet status in 2006.

Don't worry though—it's not like one planet simply fell out of the solar system. We'll explain what happened and also show you some tricks for remembering the order of all of the planets that ...

Earth is our home planet and the only one known to support life. It is the fifth-largest planet and is orbited by one moon. Our planet is the only one in the solar system to have water in its ...

The solar system is a collection of planets, moons, asteroids, comets, dust and gas that orbit our local star, the sun.

The solar system: It’s big, it’s heliocentric, and it’s got space junk to spare. Here are 24 out-of-this-world facts about the corner of space that’s home to Earth.

Venus, the hottest planet in our solar system despite not being the closest to the sun, is so primarily due to its thick, carbon dioxide-rich atmosphere creating a strong greenhouse effect.

A compilation of unexpected facts about the planets in our solar system.

Can we terraform other planets so that the human race can spread around the Solar System? – Xander, aged 14, Eindhoven, The Netherlands Of the eight planets in the Solar System, we live on Earth ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...