(a(i).1)[1]
In space physics, what quantity does the symbol $H_0$ denote?
(a(i).2)[1]
Write down the equation that gives $H_0$ in terms of the speed at which a distant galaxy is receding from Earth and its distance from Earth.
(a(ii))[1]
State the unit used for $H_0$.
(a(iii))[2]
Use this value of $H_0$ to estimate the age of the Universe in seconds.
(b)[2]
State when cosmic microwave background radiation (CMBR) was formed and where we detect it coming from.