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STAGE 1: Main Sequence-Nebula
Nebulae are made of dust and gases—mostly hydrogen and helium.
Eventually, the clump of dust and gas gets so big that it collapses from its own gravity.
The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
A star's life begins when nuclear reactions start deep in the core.
STAGE 2: Red Giant Phase-Protostar
The hot temperatures cause the outer layers of the star to expand.
When the star uses up its hydrogen fuel in the core, it can no longer hold up its outer layers. They fall inward. The center gets hotter.
As a result, the star gets bigger and the surface cools. The star is now a red giant.
A protostar is a very young star that is still gathering mass from its parent molecular cloud.
STAGE 3: The Outer Layers Blow Off - Main sequence
The gas cloud surrounding the star is called a planetary nebula.The exposed inner part of the star remains as the central star in the planetary nebula.
As the star expands,the outer layers blow off at an incredible rate. A star can lose more than half of its mass during this stage.
These central stars are the hottest stars known. They are not very luminous because they are extremely small -- about the size of the Earth.
main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness.
A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is comparable to that of Earth.
STAGE 4: White Dwarf
As bizarre as they are, white dwarfs are very common objects in the Universe.
They continue to radiate their immense internal energy into space as they continue on their journey to become black dwarfs.
STAGE 5: Black Dwarf
When they reach 4000 K these bizarre stellar objects must start to crystallize. The time this requires is very long. In fact, no white dwarf generated has yet had enough time to cool to a black dwarf.
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.
Everything will start the process again.
STAGE 6: After Black Dwarf
And the Nebulae will made up the dust and cloud and it will continue to stage 1 - 5.
When the fuel is used up, there is nothing to hold the star's layers up against gravity and the star begins to collapse. Gravity squeezes the star down into a very small size.
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
White dwarfs are some of the hottest objects in the known universe with temperatures ranging from 30,000 K to 200,000 K.
Once the black dwarf evaporated into an exotic from of hydrogen.
At the end of a black dwarf's life, the onetime star will experience proton decay and eventually evaporate into an exotic form of hydrogen.
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