Which of the following observations provides key evidence for the expansion of the Universe?
The temperature of the cosmic microwave background radiation is steadily increasing over time.
The wavelength of light received from distant galaxies is shifted towards the red end of the spectrum.
All stars in nearby galaxies are older than those in our own galaxy.
The Andromeda galaxy and the Milky Way are moving away from each other at high speed.
59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.