Isn't the Universe Infinate? Expanding without borders?
That brings up so many questions :

1. Has anyone SEEN the end of the universe to know?

How can we truely say "without borders" unless we have been out there to see that there are no borders? And how do we know that the "border" is not just 1km ahead. The point we STOP looking for boundaries could be just before we find one.

2. If it is "expanding" then what is it expanding INTO?

Lets say void. Then what is at the edge of the void? Has anyone gone into the void (or SEEN into the void) to find out if there is a boundary?

3. If it is an enlarging sphere of bent space then it is NOT infinate but it IS expanding, right?

If we DID travel in the same direction we could find "NO BOUNDARY" if we returned to the spot we started. But that would mean that the universe is NOT infinate, although its size is actually expanding.

4. We can specificallly PINPOINT how far we can see into space. As we have an ABSOLUTE number how can it correlate to an infinate universe?

Just because I cannot see the ocean from the middle of the country doesn't mean its there. I could walk for ages (3000 km in fact across Australia) and not once find the "edge" of the continent. Do I then stop and say "There is no border"... or have I just given up to early?