(contracted mass of gas that will become a star)
A protostar is an early stage in the development of a
star, formed from a contracting molecular cloud
and eventually (on the order of 10 million years)
becoming a T-Tauri star or other type of pre-main-sequence star. The protostar is heated
by the release of gravitational energy as the gas contracts.
It later ignites fusion and, if sufficiently massive,
eventually enters the main sequence.
(stars,stellar evolution,star formation)
cold mass accretion (CMA)
Herschel Orion Protostar Survey (HOPS)
Herbig-Haro object (HH)
pre-main-sequence star (PMS)
protoplanetary disk (PPD)
star-forming region (SFR)
young stellar object (YSO)