A telescope records the relative brightness of a short-lived object in a distant galaxy over several weeks.
| Time after first observation | Relative brightness |
|---|---|
| 0 days | 1.8 |
| 7 days | 2.1 |
| 14 days | 46 |
| 21 days | 63 |
| 28 days | 35 |
| 35 days | 9 |
Astronomers also measure the red-shift of the light from the galaxy.
Name the event represented by these observations.
Explain how observations of this event and the red-shift measurement could be used to investigate whether the expansion of the universe is accelerating.
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.