The idea of infinity has always been a very iffy one to me. For starters, I take things quite literally, and to add to that, I tend to overthink things. For years, I looked up into the night sky and wondered exactly where it stopped. I was old enough to understand that stars were all at different points in space, not just flat dots on the ceiling of the Earth, when I first began wondering exactly what their deals were. I figured it would have to be something like that Shel Silverstein poem-- Where the Sidewalk Ends. It would be going on and on, and then it would just stop. And that was the boundary. There was nothing on the other side of that boundary. No stars, no planets, not even empty space. Just nothing.
But then, overthinking as usual, I realized that for there to be a boundary something would have to create it. After all, there would be no boundaries on a map if there were no countries. There would be no such thing as a riverbank if there was no river. So something would have to make that boundary. And to make it, that meant that there had to be something on the other side, didn't it? There wasn't nothing outside of a country. There wasn't nothing in a riverbed. And that just destroyed the whole theory.
And then another question hit me--everything had a start and a stop. The stop was what had been puzzling me all this time. But the start? That was just as confusing. I immediately nixed the boundary idea, as it had already been disproven with my child's logic.
Then something occurred to me. You see, there used to be this song--I don't remember it now, but it was one of those annoying little ditties teaching kids about how great friendship was. It mentioned that friendship was like a circle--no start and no stop. In hindsight, I really don't see how that has anything at all to do with friendship, but it was in the song. And I thought, Oh! That's it! Space is a circle!
Then I realized that space was, in fact, three-dimensional. Circles were not.
I gave up.
The moral of the story is, don't obsess too much about the night sky. Just enjoy it.