Describe the structure of a neutral atom of carbon-12, 612C^{12}_{6}\text{C}612C.
Stars are powered by nuclear fusion reactions in their cores which release energy.
State what happens during the nuclear fusion reactions that occur in main-sequence stars.
State two regions of the electromagnetic spectrum by which a stable star like our Sun radiates most of its energy.
Describe what happens to a massive star (much more massive than the Sun) when most of the hydrogen fuel in its core has been depleted.
25 exam-style questions on CIE IGCSE Physics 6.2.2a Galaxies and astronomical distances. Each one has a worked solution and a mark scheme showing where the marks go.