Draft:Hades the Exoplanet
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Hades is a newly theorized planet that helped form the Solar System into what is is today. Hades was mostly likely positioned between Saturn and Neptune, before Neptune and Uranus switched places. What led astronomers to the theory of Hades is the fact that Uranus and Neptune couldn't have formed where they are today 4.5 billion years ago. The theory goes that the gas giants (Jupiter, Saturn, Uranus, and Neptune (and possibly Hades)) had to be formed from a disk of gas, and it would just be too thin for Uranus and Neptune to be do bulky. The idea is that the planet were packed together and spread out once the gas and dust was used up. However, the gas giants wouldn't have gone quietly to their new homes. Simulations proved that one of the ice giant (Uranus and Neptune) would have been ejected. David Nesvorny of the Southwest Institute in Boulder Colorado said "People didn't know how to resolve that." He theorized that a sacrificial ice giant between Saturn and Neptune had to be ejected from the Solar System for everything to be how it is today. “If you start with five gaseous planets, then you see again that you lose one planet,” Nesvorny says. “In a large fraction of cases, you end up with a good solar system analogue.” He ran a total of 6,000 simulations. All but ten percent of the four-planet simulations were there only three left. In half of the five-planet simulations did everything end up close to how it is today. Hades was most likely ejected from the Solar System after an encounter with Jupiter. The mass of the planet threw Hades out of the Sun orbit.