Humanity has long dreamed of travelling and settling among the stars. The fact is that like any other star, the Sun, will one day succumb to gravity and run out of its primary fuel, hydrogen. When this happens, life on earth will become impossible, as the sun envelops our planet. Understandably then, many have considered the possibility of colonising planets beyond our solar system in order to ensure the survival of 'Earthians' (my moniker for humans...