Scientists use red-shift as evidence for the Big Bang model.
Which statement explains how red-shift supports this model?
Galaxies are cooling as they move away, so the universe began very hot
Galaxies are all moving towards one point, where the universe will end
Galaxies move away at a constant speed, so the universe never changes
Galaxies are moving apart, so they were once close together in a small region
50 exam-style questions on OCR GCSE Physics 8.3 Beyond Earth, covering 8.3.1 Red-shift and the expanding universe, 8.3.2 Evidence for the Big Bang model, 8.3.3 Formation of the Sun and stellar equilibrium, 8.3.4 Radiation emitted by hot bodies, 8.3.5 The solar system and satellites, 8.3.6 Gravity and circular orbits, 8.3.7 Orbital radius and orbital speed, 8.3.8 Radiation balance and the temperature of the Earth, and 8.3.9 Seismic waves and exploring hidden structures. Each one has a worked solution and a mark scheme showing where the marks go.