The Caldwell Catalog was assembled in the 1990s
with 109 diffuse objects that are not in the Messier Catalog
but are just as easily viewed by amateur astronomers.
Amateur astronomers use the Messier Catalog as a list of bright,
easily-seen galaxies, Globular Clusters and Nebulae
for potential viewing,
but Messier's actual goal was to list those that could be confused
with Comets, skipping some easily-seen diffuse objects
based upon his purpose.
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