APOD 3.4- Rosette Nebula

The Rosette Nebula, NGC 2237, is an enormous emission nebula located in the constellation Monoceros, nearly 5,000 light years away and 100 light years in width. An open cluster of stars about 4 million years old  is inside the nebula is home to many bright young stars, NGC 2244. The nebula appears to glow because of ultraviolet light being emitted from the star cluster. The center of the Rosette Nebula appears to be darker because it is a hole, surrounded by hot gas and gas, being created by stellar winds.