(a)[2]
Write these objects in order of size, starting with the smallest and ending with the largest.
(b(i))[1]
State what redshift tells us about the motion of distant galaxies.
(b(ii))[1]
State why redshift in light from distant galaxies provides evidence for the Big Bang Theory.
(c(i))[1]
Define a light-year.
(c(ii))[1]
Suggest one reason, apart from cost, why scientists do not launch spacecraft to planets beyond the Solar System.
(d)[3]
Calculate how far apart the Sun and the Earth are.