Distance indicator · Secondary rung

Tully–Fisher Relation

An empirical relation for spiral galaxies between how fast they rotate and how luminous they are — the faster the rotation, the brighter the galaxy. Measuring the rotation (from the width of the 21-cm line) then gives the luminosity, and comparing with the apparent brightness gives the distance.

The Cosmic Distance Ladder
Spiral Galaxy
Galaxy Rotation Curves

Knowledge connections

Associated withThe Cosmic Distance Ladder
Associated withSpiral Galaxy
Associated withGalaxy Rotation Curves

Sources

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

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Tully–Fisher Relation

Methods, objects & facilities

Knowledge connections

Sources

Tully–Fisher Relation

Methods, objects & facilities

Knowledge connections

Sources