There's no end to space. We can look up and see the stars or the moon, but there's far more beyond that which we can't see. I guess the moon would be a good example: that's what a planet is like. A mass of rock and other substances in a spherical shape, except much bigger. There's a great deal of them, but we can't see them since they're so far away from us.
[Have fun being confused all over again, Kija. Sorry.]