Life Cycle of Stars — GCSE Physics Revision
Revise Life Cycle of Stars for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Red-Shift & Big BangWhat is Life Cycle of Stars?
Stars are formed from clouds of gas and dust (nebulae) that collapse under gravity. The life cycle of a star depends on its initial mass. Stars of a similar mass to the Sun will become a red giant, then a white dwarf, and finally a black dwarf. Stars much more massive than the Sun will become a red supergiant, then explode in a supernova, leaving behind either a neutron star or a black hole.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The Hertzsprung-Russell diagram, which plots star luminosity against temperature, is a useful tool for understanding stellar evolution and is a focus for AQA.
Step-by-step explanationWorked example
Our Sun is a medium-sized star. What is its expected life cycle? Solution: The Sun will eventually swell up to become a red giant, engulfing the inner planets. It will then shed its outer layers to form a planetary nebula, leaving behind a dense, hot core called a white dwarf. This will slowly cool over billions of years to become a black dwarf.
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Common mistakes
- 1Confusing the life cycles of small and large stars. The end stages are very different (white dwarf vs. neutron star/black hole).
- 2Thinking that all stars end up as black holes. Only the most massive stars do.
- 3Not knowing the correct sequence of stages for each type of star.
Life Cycle of Stars exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Life Cycle of Stars
Core concept
Stars are formed from clouds of gas and dust (nebulae) that collapse under gravity. The life cycle of a star depends on its initial mass. Stars of a similar mass to the Sun will become a red giant, th…
Frequently asked questions
What is a supernova?
A supernova is a powerful and luminous explosion of a massive star. For a short time, it can outshine an entire galaxy. The explosion scatters heavy elements, which were created inside the star, across space.
How are elements heavier than iron formed?
Elements up to iron are formed by nuclear fusion inside stars. Elements heavier than iron are formed in the extreme conditions of a supernova explosion.