Re:Arthur C Clarke (Score 4, Informative)

There is a short-story by Clarke about a universe that contains only one sun and one planet, the universe is about as big as the planets orbit. The planet is constantly showing the same face toward the sun, it has a day-side, very hot, and anight side, very cold. Humans live around the equator where the temperature is right.

In the book the universe actually ends somewhere around the north pole(dark side) of the planet and a long time ago humans built a great wall to hide the end of the universe... great short-story.