All stars spend the majority of their lives as so-called main-sequence stars. Consequently the vast majority of stars—90% or so—are undergoing hydrogen-helium fusion at any given time.

Lynds bright nebula 483, seen in infrared light by the JWST. (Image credit: NASA/ESA/CSA/STScI) The jets are formed by material with a rich abundance of varied molecules falling onto young protostars.