The Rosette nebula is also known as Caldwell 49. It is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. It is 130 light-years in diameter & is located about 5,219 light-years away from Earth.
The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses. Approximately 2500 young stars lie in this star-forming complex. Most of the ongoing star-formation activity is occurring in the dense molecular cloud to the south east of the bubble.
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