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abstraction > hypothesis > theory > astronomy theory > galaxy theory > Tully-Fisher relation |
Tully-Fisher relation | ||||
subject | fact |
Tully-Fisher relation | has 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. | |
is a kind of galaxy theory | ||
galaxy theory | has domain extragalactic astronomy | |
theory | has validity correct or incorrect with caveats | |
has author or reasearch group | ||
has date or a range of dates for which the theory was active |