^ That's pretty darn cool, thanks. Among the things you'll learn: - Around 4000 miles into Neptune's crust, there is a sea of hydrogen where carbon crystallize

^ That's pretty darn cool, thanks. Among the things you'll learn: - Around 4000 miles into Neptune's crust, there is a sea of hydrogen where carbon crystallizes into diamond which falls like rain to the center of the planet forming a diamond layer. And that layer is actually solid crystals of diamond inside a sea of metallic liquid carbon. Lol wat? Damn, nature.