A color photo of galaxy NGC 3198. It is relatively grainy compared to most modern Hubble and JWST images.

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1. Robert McNees (mcnees@mastodon.social)'s status on Sunday, 23-Jul-2023 20:06:29 UTC Robert McNees

   in reply to

   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