The Rosette Nebula (also known as Caldwell 49) is a large,
spherical (circular in appearance)
H II region located near one end of a giant molecular cloud
in the Monoceros region of the Milky Way Galaxy.
The open cluster NGC 2244 (Caldwell 50) is closely associated
with the nebulosity, the stars of the cluster having been
formed from the nebula's matter.