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The early stage of a stars development. Proto- means early or before. The protostar's mail goal is to achieve equilibrium

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The sun's life connects to human and animal's lives. For example, the Nebula is the early stage of the sun's development. That relates to a fetus, in being the early stage of a human's development. The protostar is most like an infant or a toddler. The main sequence star relates to the stage we are all in today. Eventually humans die, and stars will too.

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A star can become very dense and turn into a Neutron Star or the core can completely vanish and become a Black Hole.

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The supergiant explodes and blasts away outer layers. The explosion releases huge amounts of energy destroying the star in the process.

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The star becomes a red giant and the atmosphere starts to cool down. Over time the outer layer starts to drift away.

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Red Supergiant star. Stars are composed of about 75% Hydrogen and 25% helium.
At this time, Betelgeuse is in the late stage of it's evolution. It is the 9th brightest star in the sky. It is estimated that it will explode as a supernova in about 430 light years.
The layers of a star:
Core: Nuclear fusion occurs.
Radiative zone: Energy from the core moves outward to electromagnetic radiation.
Convection zone: Outermost layer of the sun's interior
Photosphere: Light is radiated.
Cromosphere: Hydrogen admits light which creates a red color.

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The Star becomes more dense. Hydrogen and Helium stay in the atmosphere. Nuclear reactions start to occur.

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It is a huge super-heated body of mass from clouds of dust and gas. The compressed part of the nebula gets smaller and heats up. It eventually become protostar.