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!

To honor Pluto, Brainly, the world’s largest online learning platform, compiled their five favorite facts about the dwarf planet.

Mars is a planet with so much more to discover. Research has been done on the planet to test its sustainability for life, and more continues today.

Where it is: 142 million miles (228 million kilometers) from the sun, on average How big it is: 4,222 miles (6,795 km) wide, about half the diameter of Earth How long a day lasts: 24.6 hours How ...

Discover interesting facts about Saturn, its rings and whether it could contain extraterrestrial life.