Astronomers use two models to predict the position of an unseen planet that could be causing changes in the orbit of another planet.
Positions are measured in degrees along the same scale.
| Result | Position in degrees |
|---|---|
| prediction from model A | 35 |
| prediction from model B | 118 |
| position of the new body observed using a telescope | 120 |
Explain which model is better supported by the observation and what scientists should do before accepting this model.
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.