The life cycle of a star depends on the balance between gravity and thermal expansion.
Explain why a cold cloud of dust and gas in a nebula collapses.
As the cloud collapses, the temperature of its core increases.
Explain why, in terms of energy.
Explain how the core of a star of similar mass to the Sun changes when the hydrogen in its core runs out, and why this causes the outer layers of the star to expand.
Suggest why a white dwarf is very dense.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.