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A comment on A New World’s Extraordinary Orbit Points to Planet Nine.

Re:A New World’s Extraordinary Orbit Points to Planet Nine by Jaruzel on Friday May 18, 2018 @03:27AM (#17099355)
Something I've never understood: Why is our known solar-system on a flat plane? Why don't the planets all have different orbital axis? Is there a body (or bodies) out there exerting a force on the planets to keep them all in the same plane?
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Re:A New World’s Extraordinary Orbit Points to Planet Nine by DavidSJ on Friday May 18, 2018 @03:35AM (#17099378)
It’s not perfectly flat, but somewhat close to it, because all of our solar system’s planets formed from the same accretion disk, during which time there was opportunity for exchange of angular momentum.
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Re:A New World’s Extraordinary Orbit Points to Planet Nine by archevel on Friday May 18, 2018 @03:38AM (#17099394)
There is a brief explanation here:

http://curious.astro.cornell.edu/about-us/57-our-solar-syste...

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Re:A New World’s Extraordinary Orbit Points to Planet Nine by Jaruzel on Friday May 18, 2018 @05:22AM (#17099918)
Thx! Perfect succinct explanation, including 'so why is the disc of dust flat' question that immediately followed!
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