Add Yahoo as a preferred source to see more of our stories on Google. Earth’s magnetic field plays a key role in making our planet habitable. The protective bubble over the atmosphere shields the ...

Earth’s history spans 4.5 billion years, and throughout this vast timeline, our planet has been home to creatures so strange they seem ripped from the pages of science fiction. From ancient seas ...

Every director has their own vision for this creature, so it's seen many subtle changes across the years – see the head ridges of Cameron's "warrior" variants, or David Fincher's dog-like "runners".

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