State what is meant by the 'red-shift' of light observed from distant galaxies.
Practise Edexcel GCSE Physics The Big Bang, red-shift and the expanding Universe with exam-style questions for Foundation and Higher tier. 80 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.