A computer model divides a large volume of the Universe into cells of equal volume. As the model Universe expands, more cells are added to represent the increase in space.
The table shows the model output at two stages.
| Stage | Number of cells | Average mass in each cell / kg |
|---|---|---|
| 1 | 250 | 4.0 × 1039 |
| 2 | 600 | 4.0 × 1039 |
Calculate the factor by which the total mass represented by the model increases from stage 1 to stage 2.
Explain which theory of the Universe is represented by the model.
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.