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Tully-Fisher relation
subjectfact 
Tully-Fisher relationhas definition An observed relation between the intrinsic luminosity of a spiral galaxy and the rotational speed of its stars. More luminous galaxies have stars that are moving faster.has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:34:02.0
is a kind of galaxy theory2001-09-27 09:34:02.0
galaxy theoryhas domain extragalactic astronomy2001-09-27 09:34:02.0
theoryhas validity correct or incorrect with caveats2001-09-27 09:33:53.0
has author or reasearch group2001-09-27 09:33:53.0
has date or a range of dates for which the theory was active2001-09-27 09:33:53.0