A detector receives a weak microwave signal from every direction, even when it is pointed away from visible stars.
Why does this support the Big Bang theory?
It shows that every galaxy is moving towards the Earth.
It matches the expected cooled radiation from the early Universe.
It shows that new matter is continuously formed between galaxies.
It matches the expected reflected radiation from nearby planets.
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.