(a(i))[2]
State the names of planet X and planet Y.
(a(ii))[2]
State two further differences between Mercury and Jupiter.
(a(iii))[3]
Complete the sentences about the Solar System. According to the accretion model, the Solar System formed from clouds of dust and [BLANK]. The material in the Solar System was pulled together by [BLANK]. The galaxy that contains the Solar System is called [BLANK].
(b)[3]
Complete the statements below by inserting the missing units. (i) The Earth orbits the Sun in approximately 365 [BLANK]. (ii) The Moon orbits the Earth in approximately one [BLANK]. (iii) The diameter of the Milky Way is approximately 100 000 [BLANK].