Older galaxies mostly tend the revolve forming a disk. Why are the stars not revolving around the center of the galaxy like a sphere instead similar to electron in an atom?
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$\begingroup$ The title mentions the Solar System, but the question body doesn't, and the answers to the two cases are rather different in detail. Perhaps just ask about one (at a time)? $\endgroup$– Kyle OmanCommented Jun 23, 2016 at 1:55
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3$\begingroup$ Related: physics.stackexchange.com/q/93830/2451 , physics.stackexchange.com/q/8502/2451 , physics.stackexchange.com/q/12140/2451 , physics.stackexchange.com/q/26083/2451 , and links therein. $\endgroup$– Qmechanic ♦Commented Jun 23, 2016 at 3:42
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$\begingroup$ No they aren't. Look at the pictures in Rob Jeffries' answer physics.stackexchange.com/questions/148418/… $\endgroup$– AHusainCommented Jun 23, 2016 at 2:47