(a)[2]
State what is meant by the term ‘supernova’.
(b)[2]
Describe how a protostar develops inside a nebula.
(c(i))[1]
State the name of the galaxy in which our Sun is located.
(c(ii))[1]
State what is meant by the term a light-year.
(c(iii))[3]
One full orbit of our Sun around the black hole takes $7.3 \times 10^{15}\,\text{s}$. The separation between our Sun and the black hole is 26 000 light-years. $1\,\text{year} = 3.2 \times 10^{7}\,\text{s}$, speed of light $= 3.0 \times 10^{8}\,\text{m s}^{-1}$. Calculate the speed of our Sun as it orbits the black hole. Show your working and give your answer in $\text{m s}^{-1}$.