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Stellar Evolution

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Robert Nelson

on 14 March 2014

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Transcript of Stellar Evolution

The Life Cycle of Stars
Stars Are Born
Stellar Adulthood
Large Stars Life
Small to Medium Mass Stars
Super Massive Stars
The Future of the Universe
Stars form from nebula's
Nebula's are gas and dust
This material comes from exploded stars
This gas and dust slowly condenses
and heats up.
Eventually the star starts to burn.
These are called protostars
Stars will spend most of their lives in the Main Sequence.
The old age of a star depends on their size.
Small and medium stars fade away.
Giant and super giant stars explode.
Will become red giants as the hydrogen fuel runs out.
As the fuels runs out, the star swells out and becomes large.
The sun will swell and swallow up the inner planets.
As the fuel runs out, the star will go nova.
This is where it blows off a layer, and then collapses.
What remains is called a white dwarf.
This will eventually cool to black.
Stars with a mass of 11x more than the sun will not create a planetary nebula.
These massive stars will explode in a supernova.
The outer layers explode outwardly,
the inner layers explode inwardly and
are compressed.
The end result is not a white dwarf.
It is a neutron star.
This is super dense and has high gravity.
Stars that are larger than 40x the size of
the sun will explode in a supernova.
The end result will be different than the other massive stars.
The leftover material from the supernova won't be a neutron star.
The end result will be a black hole.
Black holes have so much gravity
that nothing escapes.
Not even light!
The material blown away from stars will only last
so long.
In the end, all that will be left will be black holes and burned out stars.
Full transcript