"(The stars) remind us of the puny distances we men travel; the nearest one, Alpha Centauri, is four light-years away, far beyond our capability to visit today

"(The stars) remind us of the puny distances we men travel; the nearest one, Alpha Centauri, is four light-years away, far beyond our capability to visit today or in our lifetime, yet beckoning, mocking us and our dreams." - Mike Collins (Apollo 11 astronaut)