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8/24/2016 11:37:50 PM
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由The Cellar Door编辑： 8/24/2016 11:49:04 PMThey're as close to coplanar as you could really expect nature to cause, and it's also no surprise that the terrestrial planets have higher differences in inclination because they are less massive, they have faster revolutions about Sun, and Jupiter is constantly flinging shit at them.
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Conservation of angular momentum and principle of least action. It takes less energy for these objects to move in the same plane, so they move in the same plane, because the universe is lazy and likes to do the least it possibly can. Think about it, if they were all in different planes, all tugging on eachother differently, more gravitational energy would be being expended as opposed to them being in relatively the same plane. Imagine if you had a graph, and you had a point at (4,0) and then you had a point at (3,3). That point at (3,3) is farther away from the origin than (4,0) is, because of its 2nd dimension, the y-coordinate.
