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A main sequence star in a distant galaxy is the same size and mass as the Sun - AQA - GCSE Physics - Question 3 - 2021 - Paper 1
Question 3
A main sequence star in a distant galaxy is the same size and mass as the Sun. Explain why the star is stable while it is in the main sequence stage of its life cyc... show full transcript
Worked Solution & Example Answer:A main sequence star in a distant galaxy is the same size and mass as the Sun - AQA - GCSE Physics - Question 3 - 2021 - Paper 1
Step 1
Explain why the star is stable while it is in the main sequence stage of its life cycle.
Answer
A main sequence star is stable because the gravitational force pulling inward is balanced by the outward pressure generated by nuclear fusion reactions occurring in its core. The energy produced through fusion counteracts the gravitational collapse, maintaining equilibrium.
Step 2
Describe what will happen to the star between the main sequence stage and the end of the star's life cycle.
Answer
The star will first expand into a red giant as it exhausts its hydrogen fuel in the core, leading to the fusion of heavier elements. Eventually, it will shed its outer layers and collapse into a white dwarf. Over time, the white dwarf will cool and fade, becoming a black dwarf.
Step 3