Discover interesting facts about how big earthquakes can get, why earthquakes happen, and why they're so hard to predict.

Because the Moon is over a quarter the diameter of Earth, the Earth-Moon system is often cited as the pairing in our Solar ...

Mars will appear to make an ultraclose approach to the moon on Sunday, after Jupiter had a turn earlier this week. Here's how ...

"An epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a journey ...