Life Cycle of a Star

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by Schwaijo
Last updated 6 years ago


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Life Cycle of a Star

Life Cycle of a Star

The stars start as a giant cloud of dust and gas (like Hydrogen) , called a Nebula. (This can form more than 1 star)

A Gravitation Force tries to pull the gas and dust together. Eventually it starts to spin increasing pressure ' temperature.This is called a Protostar.

Both these stars are in the Main Seguence on the H'R Diagram.They are in there "Stable Stage"

The temp increases enough to allow Nuclear Fusion to happen, which 2 hydrogen atoms collide with enough force to create helium atoms. This allows the star to glow. It also counter-acts gravity

This is a Massive star.

This is a small star, like our sun.

Note:Picture are not actual sizes

These stars have run out of hydrogen, and are getting hotter to try and "mix" the helium. This causes them to swell and get bigger, but this process can take a long time. This are in there "Dying stage" This is the beginning of the end.

This is a Red Supergiant.This is in the Supergiants section in the H'R Diagram

This is a Red Giant. It would be in the Giants section in the H'R Diagram.

Important: Everything in the life cycle depends on the mass of a star.

These stages can form other stars. These stages can actually not take a long time.

This is a Planetary Nebula. This is when a star compresses helium into carbon, then tries to compress carbon, but it doesn't work. That causes the star to shed its outer layers

This is a Supernova. This is when the star gets hotter trying to make other fuels, but it may end with a iron core, which pressure from gravity causes it to basically explode and throw minerals from the star, in space

This is a Neutron star it is mostly made up of neutrons, which the core survived the supernova, it is created by the pressure in the supergiant combining electrons and protrons.

This is a black hole. When a supergiant was very large, even the core of neutrons will not survive. This will form a black hole. Nothing can escape a black hole, not even light.

This is a black dwarf. This is whats left after a white dwarf burns out. It is basically a cold dark mass.

This is a white dwarf, it is what is left after the outer layers leave the gravity is counter-acted by the electrons. It of course in the white dwarfs section in the H'R Diagram

A video better explaining planetary nebulas.


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