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That depends on the mass of the proto-star.
A protostar is the first building block of the main star. As it has not yet accumulated enough mass to join the main sequence, it will be smaller than the main star. The next stage will be a T Tauri star.
It must collect enough mass in order for gravity to be able to turn it into a sphere.
I actually thought that would be when the star starts fusing hydrogen into helium... But apparently there are other stages between those two.According to Wikipedia, "[The protostar phase] ends when the protostar blows back the infalling gas and is revealed as an optically visible pre-main-sequence star, which later contracts to become a main sequence star."Pre-main sequence means the star is not yet on the main sequence; and that, in turn, basically means that it is not yet fusing hydrogen into helium.
A Brown DwarfSee related question
No, Its called a demo for a reason.
Where you do a full turn or a half turn
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It is a measure of a part of a full turn.
Kepler 16b has two suns because it is part of a binary star system meaning that at some point in the stars' development from a protostar to a regular star it split into two separate discs, which then in turn developed into two smaller stars, or in this case one sun is larger than the other. It works similarly to the process of creating identical twins.
In full turn,there are 360 degrees.
a dwarf star