Orion complex

The Orion complex (sometimes called the Orion  molecular cloud complex) is a huge star-forming area in the constellation of Orion.SIMBAD.   

It is a large group of bright nebulae, dark clouds, and young star clusters. The cloud is between 1,500 and 1,600 light-years away and is hundreds of light-years across. Several parts of the nebula can be seen through binoculars and small telescopes. Some parts (such as the Orion nebula) are visible to the naked eye.

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.

 Nebulae in the complex 

The following is a list of notable nebulae in the larger nebula complex:
 The Orion nebula, also known as M42
 M43, which is part of the Orion Nebula
 IC 434, which contains the Horsehead Nebula
 The Horsehead nebula
 Barnard's Loop
 M78, a reflection nebula
 NGC 1999
 NGC 2175
 NGC 2174
 Various Orion molecular clouds
 Flame nebula (NGC 2024)

Also the Orion OB1 Association is part of this complex. This is a group of several dozen hot giant stars of spectral types O and B. These are blue  and blue-white stars.

 References 

Other websites
Orion Cloud Complex
SEDS website
Clickable table of Messier Objects 
Orion images 

Category:Astronomical objects
Category:Super star clusters