A small number of nearby galaxies show blue-shift rather than red-shift.
What does this tell scientists?
The universe is shrinking in some directions
The red-shift measurements must be incorrect
A few nearby galaxies are moving towards us
Those galaxies are further away than the others
41 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.