life cycle of a star. stage 1 protostars protostars huge clouds of gas (hydrogen) in which stars are...
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Life Cycle of a StarLife Cycle of a Star
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Stage 1Stage 1
ProtostarsProtostars
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ProtostarsProtostars
• Huge clouds of gas (hydrogen) in which stars are made.
• Many thousands of times bigger than our solar system
• As the clouds collapse stars are born in them
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Stage 2Stage 2
Main sequence starMain sequence star
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Main Sequence StarMain Sequence Star
• E.g. Our sun• Sequence lasts for
about 10 billion years• Our sun is about half
way through it’s main sequence
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Stage 3Stage 3
Red GiantRed Giant
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Red GiantRed Giant
• As the sun runs out of hydrogen the outer layers of the sun will become cooler
• They will also expand massively.
• The Earth (along with Mercury, Venus and Mars) will be swallowed up.
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Stage 4Stage 4
White DwarfWhite Dwarf
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White DwarfWhite Dwarf
• Gravity will cause the red giant to collapse
• The sun is now much cooler and it collapses into a small white star
• It still has the same mass as the original sun!
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Stage 5Stage 5
Black DwarfBlack Dwarf
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Black DwarfBlack Dwarf
• The sun cools more and more
• Eventually it will become a black mass emitting no light
• It will then spend the rest of eternity drifting silently through space
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Stars bigger than our Sun!Stars bigger than our Sun!
At least four times biggerAt least four times bigger
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Stage 4Stage 4(for a big star)(for a big star)
Red SupergiantRed Supergiant
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Stage 5Stage 5(for a big star)(for a big star)
SupernovaSupernova
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Supernova!Supernova!
• The largest and most powerful explosions in the universe.
• The red supergiants literally blow themselves apart!
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SupernovaSupernova
• All the atoms we are made from came originally from these giant supernova explosions.
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Stage 6Stage 6(for a big star)(for a big star)
Black holeBlack hole
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Black holeBlack hole
• After the supernova a huge mass is left behind.
• There is so much mass its gravity prevents even light from leaving it
• Black holes can suck in nearby stars and solar systems.
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• Luckily there are no black holes any where near our sun!