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Did a Planet Escape the Solar System?

Astronomers still aren’t sure about how our solar system might have formed, but they have simulations to help them get closer to the answer!

Planet 9: https://www.youtube.com/watch?v=I0thBlCkSdI
Were the Planets Always in the Same Order?: https://www.youtube.com/watch?v=UYMsaFcv83Y

Hosted by: Caitlin Hofmeister
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Sources:

http://physicsworld.com/cws/article/news/2011/nov/21/was-a-giant-planet-ejected-from-our-solar-system
http://www.psrd.hawaii.edu/CosmoSparks/Nov16/dynamical-evolution.html
https://www.newscientist.com/article/dn20952-missing-planet-explains-solar-systems-structure/
https://arxiv.org/abs/1110.5042
https://arxiv.org/abs/1109.2949
https://arxiv.org/abs/astro-ph/0111290
http://phenomena.nationalgeographic.com/2014/03/13/a-guide-to-lonely-planets-in-the-galaxy/
http://phenomena.nationalgeographic.com/2016/01/22/how-can-we-find-planet-nine-and-other-burning-questions/

Images:

Nice model: https://en.wikipedia.org/wiki/Nice_model#/media/File:Lhborbits.png
Rogue planet: https://en.wikipedia.org/wiki/Rogue_planet#/media/File:Alone_in_Space_-_Astronomers_Find_New_Kind_of_Planet.jpg
Star System: https://commons.wikimedia.org/wiki/File:A_cosmic_couple.jpg
Planet Nine: https://commons.wikimedia.org/wiki/File:Planet_nine_artistic_plain.png

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