Which of these observations provides direct evidence that distant galaxies are moving away from us, supporting the theory that the Universe is expanding?
The blue-shift of light from nearby stars
The cyclic change in sunspot activity of the Sun
The red-shift of light from distant galaxies
The occurrence of supernovae in our own galaxy
53 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift, covering 7.2.1 Big Bang and Steady State theories, 7.2.2 Evidence for the Big Bang, 7.2.3 The Doppler effect and red-shift, 7.2.4 Red-shift as evidence for an expanding Universe, and 7.2.5 The CMB and the accepted model. Each one has a worked solution and a mark scheme showing where the marks go.