The diameter of the Sun is 1.39 million kilometres and the Earth is 8.3 light minutes far away.
Proxima Centauri is the nearest star - it has a distance of 4.24 light years to our Sun.
(a) How long does it take to travel to Proxima Centauri with
(i) an airplane (920 km/h) or
(ii) with the Voyager 1 space probe (17 km/s).
(b) Let the Sun have the size of a tennis ball (diameter: 6.7 cm): How far away is the Earth and
how far away is Proxima Centauri on this scale?​