I don't know about the rest of you, but I have a differant type of thinking then the ones that have been previous posted
One thing I agree on, the universe
is growing, but not the way you've explained it
stars do exist, their not little reflections from the end of some giant ball thats floating around other floating objects like boxes and stuff, their actual burning objects in space (don't say there's a end to them, thats just like saying the world is flat)
they where created, and formed by something else
I'm not going to get into the whole "what created them" conversation, theres no proof for any of it, so theres no way for you to prove your way or for me to prove mine, all we can prove is they
where created
now, as for how they're growing, I
think their is a bunch of objects formed differant ways and differant sizes, they're all moving in different directions, and can get stopped by other objects and made to orbit them, but that doesn't mean they're stopped completely, these bigger objects are always orbiting something bigger, much further away
I think all the objects are spread out, and are growing millions and millions of miles apart, eventually they will grow enough to where they're closer and closer together, but that won't be anytime soon

to sum it all up, the universe doesn't have a end because the end would just be empty untill it's filled up, and there's no way of saying there's nothing behind that