Between stars and galaxies, with no radiating visible light, is the Interstellar Medium, which will in parts condense due to some shockwave force in space and thus create fragmented clouds: future stars.
The start of star formation thus means that particles of the ISM are being pulled closer and more compactly together, soon giving off rays that infringe on the visible spectrum and thus make them opaque clouds which are closing in and heating up.
Both stages four and five embody protostars, the begining types of stars just before they become hot enough to fit the definition of a full star. This protostar is a classical T Tauri, fitting the bill of a protostar emmiting large amounts of visible light as its core heats.
Once the protostars are hot enough, they will becoming regular stars, but not fit into the main sequence. Its luminosity will be greater than that of other stars. They will be hotter and expand before they cool a little and conform with the rest of the star body, which is where it will stay for the rest of its stellar life.
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