A beautiful star forming regions with exquisite nebulosity and visible young stars recently born.
The Rosette is over 5,000 light years away and has a diameter in the region of 130 light years.
The whole area glows brightly due to the young hot stars contained within the cloud. They are pumping out many types of radiation which excites the surrounding gases which themselves then emit radiation, including at visible wavelengths.
These baby stars have been born within this cloud and you can see a number in and around the central region of the Rosette. These stars have also created the shape of the Rosette, blowing out gas and dust from the central region, hence the darker centre.