A protostar is a star that is just beginning to form out of a stellar nebular (under gravity). The core of the gravitational collapse is getting more and more massive and is heating up as a result of the gravimetric contraction but has not yet reached the point where nucleosynthesis has begun in its core. It is when this happens that it becomes a star.
The term is "protostar", not "prostar". Yes. A protostar is an early stage of a star.
through the process of fusion, it becomes a star: the birth of the star is the start of fusion. therefore, it is after fusion that it is classified as a star.
mass
Protostar!
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A protostar is more like a stage previous to a star - before it ignites.
The actual FIRST STAR is impossible to say when it existed. In the normal evolution of a star it becomes a protostar first. The life of a protostar is about 150,000 years before it becomes a main sequence star. But in the Early universe it is hard to say what was happening. They could have formed in days weeks months or even hours.
No, a protostar is basically the BEGINNING of a star's life cycle.
Protostar
A star that is forming is called a protostar.
A baby star is a newborn star. It is called "protostar."
The term is "protostar", not "prostar". Yes. A protostar is an early stage of a star.
Yes
protostar
Yes
A protostar will live as long as 100,000 years. After material stops falling on the protostar it will enter then T Tauri star phase.
That depends on the mass of the proto-star.