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galaxy theory
subjectfact 
galaxy theoryhas domain extragalactic astronomy2001-09-27 09:34:02.0
is a kind of astronomy theory2001-09-27 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

Kinds of galaxy theory :