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extragalactic astronomy
subjectfact 
extragalactic astronomyhas definition The field that deals with objects beyond the Milky Way, especially galaxies and quasars.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:32:32.0
is a kind of astronomy2001-09-27 09:32:32.0

Kinds of extragalactic astronomy :