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Transcript of Supernova
A supernova is the explosion of a star.
Red giant stars explode when the have used up their hydrogen and helium the convert most of their atoms to iron atoms.
history of supernova observation goes back to 185 CE
supernova SN 185 appeared, the oldest appearance of a supernova recorded by humankind.
In 185 CE, Chinese astronomers recorded the appearance of a bright star in the sky, and observed that it took about eight months to fade from the sky.
Red giants have a lot of gravity
pulling them upward.
They don't collapse inward because the
nuclear fusion going inside them pushes
energy outward and balances the pull of
When nuclear fusion stops, the
force of gravity pulls the star inward.
When a star explodes it shoots out
billions of atoms into space, where they form a huge cold of dust called a
Most of the carbon, oxygen, nitrogen,silicone, and iron comes from supernova explosions.
Nebulae comes from SNR (supernova remnant)
SNR is the structure resulting from the explosion of a star in a supernova.
The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way.
Different types: Type1a, Type1b, Type1c, Type2