Orion complex
The nebula is important because of its sheer size. It is also one of the most active regions of stellar formation that can be seen in the night sky. In it are protoplanetary discs and many very young stars.  The nebula is very bright in the infrared wavelengths due to the heat-intensive processes involved in star formation. The complex contains dark nebulae, emission nebulae, reflection nebulae, and HII regions.