Earth Isn't Flat, But New Theory Suggests Jupiter Might Once Have Been

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New simulations show large planets that form quite far away from their host stars start their lives not as a neat sphere, but more of a flattened disk— a shape called an oblate spheroid. As they spin, these protoplanets gradually draw in material, eventually settling into the more familiar round shape of Jupiter or a gobstopper.

That disk doesn't all wind up falling onto the star. What's left over forms the other things that make up a planetary system: the planets, the comets, the asteroids, the moons., scientists think they are gradually built from the accretion of chunks of rock that stick together and accumulate until you end up with, well, a planet.

Fenton wanted to better understand the process of disk instability planet formation, so he designed and ran complex simulations, tweaking different aspects of the process, such as the gas density, the temperature, and the velocity of the disk.

 

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