Astronomers observe red-shift in the light from most distant galaxies. Galaxies that are further away show a bigger red-shift. A student concludes that the galaxies are moving outwards through a larger, empty space.
Explain what these observations show about the universe and why the student's conclusion is not correct.
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.