An astronomical survey groups distant galaxies according to their distance from the Earth.
The table shows the mean distance and mean recession speed for each group.
| Mean distance from the Earth (million light-years) | Mean recession speed (km/s) |
|---|---|
| 250 | 5400 |
| 500 | 10800 |
| 750 | 16100 |
| 1000 | 21500 |
Using the data, explain how these observations support the Big Bang theory.
79 exam-style questions on AQA GCSE Physics 8.2 Red-shift, covering 8.2 Red-shift. Each one has a worked solution and a mark scheme showing where the marks go.