Well, some of the topics that I write about have numbers which are extraordinarily big, so for example, the distance to the closest star in miles would be trillions and trillions, and no one really knows what that is. So, I try to use an analogy. So, for example, we measure distance in space by something called the light-year, which is the distance that light travels in a year. [It] happens to be a huge number, but if you were going to go and of course you can’t go, but if you were going to go on an airplane going 500 miles an hour, it would take you one million years to go one light-year. And the closest star to us in space is 4½ light-years away. So, the chance of our visiting the closest star is probably not very great.
