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A star is born from a giant cloud of dust and gas, like what you see here, we call this the nebula
A protostar is then formed over a period of time. This is formed because gravity pulls the gas together, making it spin and heat up.
Soon enough the cloud starts to become stable and starts to glow bright. At this point it is now a star and will stay here for millions to billions of years.
Once the star begins to run out of energy and stop generating heat it becomes unstable and begins to expand, cool down and glow red, turning into a red giant. The helium core then turns into carbon.
A star's life cycle is determined by its mass. For low-mass stars after the helium turns to carbon from the red giant, the core then collapses again, and the outer layers go away.
The core then becomes a white dwarf and soon cools becoming a black dwarf
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