(a)[4]
Complete the missing words in the account of how an accretion model explains the formation of the Solar System. The planets nearest the Sun are small and [BLANK]. The planets furthest from the Sun are large and [BLANK]. All the planets were formed when a cloud of gas and dust collapsed due to [BLANK]. The spinning material in the cloud forms an [BLANK].
(b)[3]
Calculate the separation between the Moon and the Earth. Give your answer in m.
(c)[3]
Calculate the speed at which the Whirlpool galaxy is receding from the Earth.