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Messier catalog
subjectfact 
Messier cataloghas definition is an instance of nebula catalog2001-09-27 09:32:30.0
has definition Designation of objects in the Messier Catalog of nebulae, star clusters, and galaxies, published in the Eighteenth Century.has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:32:30.0
has definition List of the locations in the sky of more than 100 galaxies and nebulae, compiled by Charles Messier between 1760 and 1784. Some designations he originated are still used in identification; M1 is the Crab Nebula (in Taurus).has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:32:30.0
has definition One of the earliest catalogues of nebulous-appearing astronomical objects, compiled in 1781 by the French astronomer Charles Messier. Messier's catalogue included many objects that were later realized to be galaxies.has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:32:30.0
is a kind of nebula catalog2001-09-27 09:32:30.0
nebula cataloghas object type nebula2001-09-27 09:32:29.0