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A plot of orbital velocity data points for the galaxy NGC 3198. They increase with distance from the center, but instead of falling off past the luminous edge of the galaxy they remain roughly constant.

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A plot of orbital velocity data points for the galaxy NGC 3198. They increase with distance from the center, but instead of falling off past the luminous edge of the galaxy they remain roughly constant.
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Robert McNees (mcnees@mastodon.social)'s status on Sunday, 23-Jul-2023 20:06:29 UTC Robert McNees
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Here's a rotation curve for galaxy NGC 3198. The green line is the approximate edge of the galaxy. As you can see, there's no significant falloff - the curve is flat.
Data: K. G. Begeman, “HI rotation curves of spiral galaxies,” PhD thesis, U Groningen (1987)
Image: NASA

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