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blargerer t1_j26ab2h wrote

Reply to comment by pulsarmine in How fast does the Milky Way spin? How far does Earth move through space in a year? by Sabre-Tooth-Monkey

Except not quite, which is where the dark matter postulates come from. The Galaxies outer parts are spinning too fast and it would tear itself apart if you just modeled it after the solar system.

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pulsarmine t1_j26axlv wrote

Well, yes, but that's not relevant for a very simplistic idea of the motion of a galaxy. A singular reddit comment is not comprehensive and would take far more baseline knowledge to promote that sort of understanding.

For the average person they don't know and don't care about that smaller detail.

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