KnowraMolecular hydrogenLinked fromLinked fromThe 19 pages that link to Molecular hydrogen, each with the reason it gives.All 19Broader topic 2Related 14Compared with 321-centimeter lineCompared with: The 21-centimeter line traces atomic hydrogen, while molecular hydrogen requires other tracers.Neutral hydrogenCompared with: It is another major interstellar form of hydrogen, commonly traced through molecular emission rather than the atomic line.H I regionCompared with: It is the molecular form of hydrogen, unlike the atomic gas defining H I.