Carbon monoxide produces the largest number of photons.
A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud.
The density and size of which permit absorption nebulae, the formation of molecules (most commonly molecular hydrogen),helium and traces of carbon, oxygen and nitrogen.
This is in contrast to other areas of the interstellar medium that contain predominantly ionized gas.
In molecular cloud due to suitable conditions formation of CO takes place .
Carbon monoxide is very good at radiating infrared radiation releasing a lot of photons , and plays the role of a thermostat, dispelling any heat that manages to build up. Thus, the cloud manages to stay cool.
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