The Sun has a diameter of approximately 1 million 390,000 kilometres and is 150 million kilometres away from the earth yet its light takes a mere 8 minutes to reach us. If you imagine that the sun is not 1 million 390,000 kilometres in diameter but roughly the size of a tennis ball, earth is approximately the size of a pinhead and this pinhead would be 12 metres away from the tennis ball sun. Jupiter is the size of a green pea about a football pitch away and another 3 and a half football fields away is Pluto, a spec of dust.