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Slide 1

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The life cycle of a star-
Small star…read more

Slide 2

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Stage 1- Protostar
· A cloud of dust and gas contracts as it is pulled together
by gravity- forming a rotating disc
· The temperature increases until the core temperature is
able to support a fusion reaction and release energy
· This is the main sequence of a star (the stage the sun is
in now)…read more

Slide 3

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Stage 2- Red Giant
· Red Giants form when a protostar runs out of fuel
· As the fusion slows down, its core cools and pressure is
reduced- the core collapses
· The outer layer (hydrogen) falls inwards and heats. This
causes new fusion and expands the outer shell
· After hydrogen runs out, helium fuses into heavier
elements (carbon, nitrogen, oxygen)
· The cooling star changes from yellow to red…read more

Slide 4

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Stage 3- White Dwarf
· Once all the helium has fused, their weight will cause the
stars to collapse
· No more fusion will take place as the core is cold
· The outer layers become unstable as the star continues
to contract
· The star ejects its outer layers and forms a planetary
nebula
· The star is white dwarf- hot and dense…read more

Slide 5

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The life cycle of a star- Large
star…read more

Slide 6

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Stage 1- Protostar
·A cloud of dust and gas contracts as it is pulled together by
gravity- forming a rotating disc
·The temperature increases until the core temperature is
able to support a fusion reaction and release energy
·This is the main sequence of a star…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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