something that has aways puzzled me, so maybe someone can help....
It is of fundamental importance to the theories of physics that the laws if physics are the same everywhere in the universe.  Also, that space is the same everywhere.  How can we possibly know this? 

If someone can explain to me how we can know this, then fine, but it seems to me almost absurd to say that we KNOW that space and the laws of physics are just the same at the other end of the universe as they are here, yet, if we cannot say that, then none of the grand theories of how the universe was made and stars evolve and so on can be true!!!

oh dear!  Anyone help?