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Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Ancient rock ...

A single drilled rock sample from Mars has turned into one of the more chemically rich finds of NASA’s Curiosity mission.

What field of science could be more solid than geology? Rocks are visible, tangible. You can bang on them with a hammer, drill them, compress them, zap them with X-rays, ultraviolet light and radar, ...

The most accessible part of the earth’s interior is at the ocean’s bottom, where the crust is thin. Project Mohole, the U.S. attempt to reach the boundary layer between the earth’s crust and mantle by ...