GCSE Physics (AQA)

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Red Giants & Supergiants

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Space physics Solar system; stability of orbital motions; satellites

Red Giants & Supergiants

7:07 Life Cycle of a Star
Spec 4.8.1.2
Previous Birth of a Star Next White & Black Dwarves
  • All stars form from gas and dust in space, brought together by gravity, forming a dense and hot protostar.
  • Stars remain in the main sequence stage as they fuse hydrogen in their cores.
  • When hydrogen in the core is depleted, stars leave the main sequence.
  • Hydrogen fusion changes to helium, and when hydrogen is exhausted, helium fusion begins.
  • Low mass stars (like the sun) become red giants, swelling and increasing in brightness.
  • High mass stars become red supergiants, which are much larger and undergo fusion to create elements heavier than helium, up to iron.
  • The core of a red supergiant is hotter than that of a red giant, allowing for the fusion of heavier elements.
  • Both red giants and red supergiants expand due to the energy released from fusion reactions.
  • The stability of giants and supergiants is maintained by the balance between outward pressure from fusion and inward gravitational pull.
  • Once fusion stops (red giants when helium is depleted, supergiants when elements up to iron are formed), the stars collapse.
  • Red giants eventually become white dwarfs, while red supergiants may end in a supernova, leading to the creation of elements heavier than iron.
  • Understanding the differences between red giants and red supergiants, including their origins and fusion processes, is crucial for related exams.

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