About 4.5 billion years ago, a young Jupiter collided head-on with a planetary embryo 10 times more massive than Earth. This giant impact formed Jupiter's dilute core, which contains hydrogen and ...

Jackson Ryan was CNET's science editor, and a multiple award-winning one at that. Earlier, he'd been a scientist, but he realized he wasn't very happy sitting at a lab bench all day. Science writing, ...

Add Yahoo as a preferred source to see more of our stories on Google. Handout photo of an artist's illustration of a collision between a young Jupiter and a massive still-forming protoplanet in the ...