blackllotus,
Perhaps it is my own lack of comprehension, but I cannot perceive a universe that is without a boundary somewhere. However, I cannot perceive one that does have a limit either. One would have to ask what is beyond that boundary, which is too imcomprehensible for even science to tackle. However, I do not define the universe as being the entirety of space. The univese only encompasses the physical celestial bodies, and beyond their range, I think that there is nothing but a void. However, if anyone wishes to enlighten me, please feel free to do so.