No our Sun is a fully formed Star. A Protostar is gas that is still acreeting matter (still collecting via gravtaional rotation) to form a star. And as a result they are not very bright as they have not condensed enough to start Nuclear Fusion.
When nuclear fusion reactions began at its center.
What did the protosun form from
what is the key difference between a protosun and the real sun?
what do the largest clumps surrounding the protosun to begin to form
The eventual fate of our sun is to become a White Dwarf.
Nebular
When the sun exhausts the hydrogen in its core and become a red giant.
what is the key difference between a protosun and the real sun?
Protosun
The protosun has not fully "ignited" meaning nuclear fusion is not stably providing the energy output of the star. Once ignition takes place, the central core of the sun will produce energy almost exclusively through fusion, creating enough energy and radiation to slowly wash away the nebulous gas surrounding the protosun revealing the sun itself.
The Protosun
Heat, derived from gravitational energy. The gravitational collapse of the original nebula of gas and dust produced very high temperatures and a "protosun". Eventually the protosun became a star (our Sun) when the nuclear fusion reactions began at temperatures of millions of degrees Celsius.
what do the largest clumps surrounding the protosun to begin to form
A protosun is a sun (star) that is still forming. It takes millions of years of solar winds and gravitational forces to gather and compress massive clouds of hydrogen to the point where it's gravity is powerful enough to cause nuclear fusion at it's core and "ignite" a new star.
No. The sun does not have enough mass to become a black hole. When the sun dies it will become a white dwarf.
The sun is not alive, only living specis can become extinct.
The eventual fate of our sun is to become a White Dwarf.
Nebular
No. it is not massive enough. When the sun dies it will become a white dwarf.