I wrote this song about 1976 [sic] in the days when I believed it was a good idea for us to reach out into space and spread our seed, now I've seen what a horrible job we've made of this planet, I'm not quite so sure… The general idea is that if you go for a very long journey into space, and you go at speeds close to the speed of light, very, very strange non-Euclidean things happen, you get heavier, and distances appear to be distorted and, most importantly of all, time is different for you than it is for people at home. So, suppose we as astronauts go off in search of new lands, and we travel very close to the speed of light; by the time we get back, we may feel that we are only a year older, but on planet Earth, it may be that a hundred years has passed, and I fell to thinking what would that be like, it would be like a time traveller, because you would come back, and you wouldn't find any of your loved ones, so that's what I'd like you to be thinking when we're singing this song.