The Tully-Fisher relation is a technique used on spiral galaxies that relies on the Question Blank 1 of 3 (hint: two words) of the galaxies to infer the galaxy's mass. From there, they rely on the fact that the mass-to-light ratio for spiral galaxies is relatively consistent to then approximate the galaxy's Question Blank 2 of 3 (hint: one word) aka its total energy output. Knowing that quantity and how bright the galaxy appears to be allows astronomers to ultimately find the Question Blank 3 of 3 (hint: one word) to the galaxy, which is the ultimate prize of the Tully-Fisher relation.

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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The Tully-Fisher relation is a technique used on spiral galaxies that relies on the Question Blank 1 of 3 (hint: two words) of the galaxies to infer the galaxy's mass. From there, they rely on the fact that the mass-to-light ratio for spiral galaxies is relatively consistent to then approximate the galaxy's Question Blank 2 of 3 (hint: one word) aka its total energy output. Knowing that quantity and how bright the galaxy appears to be allows astronomers to ultimately find the Question Blank 3 of 3 (hint: one word) to the galaxy, which is the ultimate prize of the Tully-Fisher relation. 

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