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[–] uvb76 1 point -1 points (+0|-1) ago 

I think it has to do with the angle of view we have. All the bodies in space are moving away from each other and our sun came first. So instead of thinking of the solar system as a giant mobile flying thru space, its more like the sun is leading the way and its dragging all the planets with it. We can look outside of the solar system because the difference is minute but bodies within the system are harder to track. I think...