Astronomers record the distances and recession speeds of three galaxies.
| Galaxy | Distance from Earth (million light-years) | Recession speed (km/s) |
|---|---|---|
| A | 100 | 2200 |
| B | 200 | 4400 |
| C | 300 | 6600 |
Explain what these measurements imply about the universe in the past.
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.