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A hand-drawn plot showing the orbital speed at different distances from the center of a spherical galaxy with constant density. It increases linearly out to some distance R, where the galaxy is assumed to end, then falls off like 1/√r.

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https://files.mastodon.social/media_attachments/files/110/765/161/852/329/057/original/a5dbf0e6d71be982.jpeg

Notices where this attachment appears

  1. Robert McNees (mcnees@mastodon.social)'s status on Sunday, 23-Jul-2023 19:57:25 UTC Robert McNees Robert McNees
    in reply to

    A "rotation curve" is a plot with orbital speed on the vertical axis and distance from the center of the galaxy on the horizontal.

    For the scenario I just described, you would expect it to look something like the plot below:

    In conversation Sunday, 23-Jul-2023 19:57:25 UTC from mastodon.social permalink
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Chirp! is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.

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