(a(i))[1]
State the meaning of ‘a light-year’.
(a(ii))[1]
The Sun is one star within the Milky Way galaxy. State the approximate diameter of the Milky Way galaxy.
(b(i))[2]
Several stages make up the life cycle of a star. Complete Fig. 10.1 to show the stages a massive star passes through after the hydrogen at the centre of the star has been used up. Use words from the following list: nebula, neutron star, protostar, red giant, supernova, white dwarf.
(b(ii))[1]
State the stage in the life cycle of a star where heavy elements are formed.
(c)[4]
Current scientific understanding is that the universe began $14$ billion years ago in an event called the Big Bang. Explain one observation that supports the Big Bang Theory.