No one.
It comes from the Greek - proto - meaning first.
So first star - a protostar.
the color of the protostar is red
A Protostar.
As gravity pulls more material toward the center of the protostar, the pressure inside the protostar builds.
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.
A protostar is more like a stage previous to a star - before it ignites.
A protostar takes about 100,000 years to reach the main sequence.
No. The sun was a protostar about 4.6 billion years ago.
The term is "protostar", not "prostar". Yes. A protostar is an early stage of a star.
"Binary" means there are two stars. And "protostar" means the stars are in an early, or preliminary, stage.
Apparently someone not paying ATTENTION.
No one
trapping of thermal energy inside the protostar