Tully–Fisher relation
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Search complete. 1 mention across 1 episode found for "Tully–Fisher relation".
Oct 18, 2026
speaker_4GUEST
So they build independent backup methods to cross-check the rungs.
speaker_4GUEST
For instance, there is a principle called the Tully-Fisher relation.
speaker_3HOST
What's that?
speaker_4GUEST
This rule links how fast an entire spiral galaxy is spinning to how intrinsically bright the whole galaxy is.