What's Hidden Inside Planets?

A guided journey through the inner workings of Earth, the cloaked mysteries of other planets in our solar system, and beyond.



Earth, from space, looks like a shimmering gem suspended in an inky, infinite expanse. But this serene image masks the magnificent and volatile interior forces that make life possible for millions of species on the surface. The placid appearances of our neighboring planets similarly belie their powers-and science fiction-worthy features, like diamond rain. The daily m...