Simulation of Galaxy Rotation

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This simulation shows a hypothetical galaxy rotation curve, with no dark matter present. Instead, everything is rotating around a central mass. This should be contrasted with a different video on this channel showing a flat rotation curve, as observed,

This simulation is one of many made during creation of the Australian National University's free online astrophysics courses:

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Are all masses attracting each other (N to N), or are only affected by the central mass?

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