Credits: Keith Turnecliff, Long Itchington

The Rosette Nebula consists of several nebulae: NGC2237, NGC2238, NGC2239, NGC2244, NGC2246 and NGC2252.
However, the central section NGC2237 refers to the central section of open cluster stars.
This is the section we shall be looking at here.

Facts about NGC2244 by Keith Turnecliff

The open cluster contained within the Rosette Nebula is known as NGC 2237.
They are in fact physically associated, the open cluster being the result of star formation from the nebula.
The new stars are now blowing away the remains of the nebula.