Have you ever read the writings of Paul Dirac?

Asking a physicist if he's ever heard of or read the writings of Paul Dirac is like asking a post-revolution US founding father if he had ever heard of Benjamin Franklin or George Washington.

I'm just going to quote always here, because I can't say it any better than he already has:

Saying all science is wrong because it tends to go from inaccurate to less inaccurate is completely and utterly WRONG.

Decent theories tend to get some things right and some things wrong. Newton's Laws are not perfect - but aspects of them are just fine. For one, we know for a fact that if you apply Newton's Laws to any relevant system (not relativistic or quantum-scale), you will get an answer so accurate that our finest measurements wouldn't be able to show the error. Also, even if his actual equations aren't universal, the principles do indeed appear to be. The Law of Inertia, Newton's 2nd Law, and the Law of Reciprocal Actions - they are all present in relativistic and quantum physics. The equations change, but the some of the fundamental principles, in this case, do not.

Now yes, maybe in 100 years we'll find out that these principles aren't exact - there is always a chance of that. But the fact that they aren't perfect doesn't make them completely wrong anyway - they would still be correct within the appropriate domain. It's called Reductionism.

ah but we did "invent" time. time is a relative term and can vary wildly from one person to the next. say 2 ppl are locked in a box, neither person can see or hear anything except your voice. you ask each one how much time has gone by and you will get completely different answers.

That is totally untrue. Saying we invented time is exactly the same as saying we invented space. Time and space would both exist even if humanity or even sentience did not. We experience time, and have invented ways to measure and quantify time - but its existence is independent of our own.

the fact of the matter is it shouldnt matter how old the universe is and to try and say that the universe, an infinite body, is a xx years old is lunicy . no one can know for sure and even if they could what does it matter.

Ahahaha I love it when people say things like this. Just because you mistakenly believe that something is unknowable does not, in fact, mean it people more informed than you cannot understand or know it. We can indeed know how old the universe is (within any definition of the word 'universe'). And for one, the universe isn't necessarily infinite - either in time or in space; extraordinarily incredibly mind-bogglingly huge is just as far from infinity as the size of an atom - such is the nature of infinity. And even if it were infinite in either, it wouldn't necessarily make it any less knowable - just stranger in some ways.

However, these possibilities will still have to fall within the constraints of the laws of physics, that's assuming that all universes follow the same laws, which i figure to be probable. So, nothing that couldn't exist here would ever exist in another universe. So, sorry, no spagetti monsters, anywhere.

That needn't be exactly the case, though. Yes, the physical laws should remain constant across all universes (if indeed this bizarre theory is correct), but the fundamental constants would be able to vary, potentially resulting in some very bizarre scenarios. So while the principles would indeed be the same, the results needn't be and it becomes very difficult to find anything at all that would actually be 'impossible.'

It would be safe to assume that we are living in a nearly infinite universe, at least ever expanding. Until it stops, it's headed towards infinity. The larger the universe expands, the more possibilities there are. So, the possibility of extra-terrestrial life is headed towards infinity as well, just with a lower factor.

Thus, we can infer from this, that, say, the possibility of there being a planet identical to earth in the makings, which I would say is very very small; I'm speaking about IDENTICAL, not close, but IDENTICAL to the last atom, is increasing.

The possibility, however small, is increasing, and if the universe were to expand infinitately, there would be infinite possibility of another you and me typing this exact same conversation at another point of time millions of years from now, or whatever.

Sort of. For one, our Universe may not be infinite - and 'effectively infinite' is as far from infinite as the number 3. Something can only be 'effectively infinite' when compared to something that is 'effectively infinitesimal' in comparison. So if the universe is indeed finite, then no matter how big it is the probability of a certain event occurring could still be so small that it's chance of happening would be 'effectively zero'.

Also, the expansion of the Universe actually reduces the probability of most things. As the universe expands, matter becomes more and more separated, meaning there are fewer and fewer interactions and thus fewer opportunities for any given event to occur. If the universe were in a steady state (not expanding, not contracting) and would exist forever, then any event with non-zero probability would indeed occur at some point in time. However, if the universe expands forever (resulting ultimately in heat-death or a big-rip), then even if it exists forever, the probability of any given event still remains finite and might not ever happen.

To understand this, take the curve y = 1/x. As x approaches 0, the curve approaches infinty, and as x approaches infinity the curve approaches 0. This curve is infinite in extent, and yet the area under the curve is finite - it actually equals π. A similar thing would occur with probabilities in an infinitely expanding universe that exists forever.

So the chance that identical copies of ourselves in this universe exist (or will exist) is still, I would wager, effectively 0 (our universe is expanding at an accelerating rate). The chance that other intelligent life exists elsewhere in the universe in my opinion is rather high; however the chance that life exists close enough to us to enable meaningful communication is effectively 0, pending major scientific discoveries into FTL travel and/or communications - if possible.