A science editor is checking statements about the Universe against the predictions of two theories.
Which observation was predicted by the Big Bang theory but not by the Steady State theory?
The average density of the Universe stays constant as it expands
Absorption lines from distant galaxies are shifted to longer wavelengths
A faint microwave signal reaches the Earth from every direction in space
More distant galaxies are moving away from the Earth more quickly
94 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.