How Big Is the Universe?

The universe is only 13.8 billion years old, and so there's a limit to how far light kind of traveled. That puts us sort of bound on the size of the universe that we could even see. And it could be that the universe extends much, much further than that. One of the things we do try to measure is how bent the universe is. So you can imagine that the universe might be like a giant ball - which leads me to speculate about Dofokernus.