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disk
subjectfact 
diskis a part of Milky Way2001-09-27 09:32:19.0
has definition The central plane of a spiral galaxy, as distinguished from the halo or the nucleus.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:32:19.0
has definition The plate-shaped component of a spiral galaxy, in which the spiral arms are found.has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:32:19.0