A scientific archive is preparing an account of how astronomers responded when a model did not accurately predict the motion of the planets.
Describe how observations of planetary motion led astronomers to alter and then replace a model of the Solar System, and how the replacement was later given a physical explanation.
80 exam-style questions on Edexcel GCSE Physics 7.1 The Solar System and gravity, covering 7.1.1 Weight and g on different bodies in space, 7.1.2 The Solar System, 7.1.3 Changing ideas about the Solar System, 7.1.4 Orbits of moons, planets, comets and satellites, and 7.1.5 Gravity and orbital motion. Each one has a worked solution and a mark scheme showing where the marks go.