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Led by Cecilia Payne-Gaposchkin
Module 14 of Edexcel GCSE Astronomy. Led by Cecilia Payne-Gaposchkin, whose 1925 thesis established that stars are made overwhelmingly of hydrogen — described as the most brilliant Ph.D. thesis ever written in astronomy. The student traces the full life cycles of low-mass and high-mass stars from molecular cloud through main sequence to white dwarf, neutron star, or black hole.
Led by Cecilia Payne-Gaposchkin
The question
What forces hold a star together against its own gravity, what happens when those forces lose their balance, and why does a Sun-like star end as a white dwarf while a star eight times more massive ends as a neutron star or a black hole? The spec asks the student to use the Messier and NGC catalogues and the Bayer naming system, account for the radiation–gravity balance in main-sequence stars and the electron and neutron pressure–gravity balances in compact remnants, trace the life cycles of low-mass and high-mass stars through their named stages and approximate timescales, and apply the Chandrasekhar Limit to the question of stellar end-states.
Outcome
the student can use the Messier and NGC catalogues, apply the Bayer naming system, account for the radiation–gravity balance in main-sequence stars and the degeneracy pressures in compact remnants, trace the principal stages and timescales of low-mass and high-mass stellar evolution, and apply the Chandrasekhar Limit to compact-remnant outcomes. *(Edexcel 1AS0 Paper 2 — Topic 14, spec points 14.1–14.10)*
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