A computer model follows a dense region within a cloud of dust and hydrogen gas in space.
The table shows four snapshots from the model.
| snapshot | radius of region in m | central temperature in K | change in radius after the snapshot |
|---|---|---|---|
| A | 8.0 × 1013 | 20 | large decrease |
| B | 2.0 × 1010 | 3.0 × 106 | decrease |
| C | 9.0 × 108 | 1.1 × 107 | small decrease |
| D | 7.0 × 108 | 1.5 × 107 | no change |
State the name given to the object at snapshot B.
Describe how the data show that the region develops into a main sequence star.
Explain why the central temperature rises between snapshots A and C and why the radius does not change after snapshot D.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.