Earth Matters

4 theories about how the moon formed

Watch the first video of the rare ruby sea dragon

10 things you didn't know about dormice

Woodland creatures build snowmen, toss snowballs in photographer's winter playground

Astronomers may have found a new way to detect alien planets

Why these camera trap photos of ocelot kittens are a big deal

Everybody likes a snow day (at the zoo)

Tracey and Jon Stewart's animal sanctuary gets final blessing

Deep-space photo reveals thousands of supermassive black holes

What is clean coal?

Tequila makers helped bring this bat species back from the brink

Bumble bee gets a helping hand from Endangered Species Act