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galaxy merger
subjectfact 
galaxy mergerhas definition The formation of a galaxy from the collision of two or more separate galaxies.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:29:54.0
is a kind of merger2001-09-27 09:29:54.0
physical processhas domain physics2001-09-27 09:29:38.0