Protostar
A protostar is a very young star in the early stage of formation, still accreting mass from its natal cloud and not yet powered by sustained hydrogen fusion. It is one of the earliest stages of a young stellar object.
Formation occurs when a dense region within a giant molecular cloud collapses under gravity. Infalling gas
The protostar is initially enshrouded in gas and dust, emitting mainly infrared radiation as gravitational energy
Protostars are detected primarily in infrared and submillimeter wavelengths. They are commonly classified into evolutionary stages