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!

20 Earth Day activities that'll remind kids and adults how precious our planet is We've got fun (and free) things you can do to celebrate Mother Nature and all that she has to offer.

The trailer for the new adult animated series, Strange Planet, showcases life on a alien world curiously similar to ours, absurdities and all.