You obviously don't understand the physics we are talking about here. For every item "in the way" there would be an infinite amount of energy bombarding it over an eternity of time. This one comes down to Thermodynamics, the science of it isn't in question.
It is a logical extension of expansion, as we know it now, but you are right, currently we don't have a means to test it so it is a hypothesis. However, it is one based on actual observation and measurement, conditions not met by many other ideas.The Big Rip is a hypothesis, and it doesn't seem like it will get much further than that.
There is observation to falsify your 'five-minutes ago' concept. The Big Bang actually fits current observation (a list far too long to go into here) better than any competing idea.The beginning is also as much an speculation as the end.
Let me give you an example. I could tell you that everything began five minutes ago. That the initial state of the universe was just that, us having a discussion plus the rest of the galaxies and what not simply appearing out of nothing. That is as much of a valid explanation as saying that the universe, space and time began with the big bang. Hard-core Christians will tell you that the universe was created some thousands of years ago, and everything simply began existing right then and there.
The Big Bang Theory was not result of an attempt to explain the creation of the universe. Rather it was the result of work done to explore the repercussions of Einstein's Theory of General Relativity. Solving the GR equations lead to some astounding results, including the idea that the universe must have been smaller and hotter in the past. Then scientists started looking at those results and realizing that if that was the case then we should be able to actually see the left over heat from that primordial time. This knowledge came decades before the Cosmic Microwave Background Radiation was found (by accident). There were many other predictions made based on General Relativity, most of which have since been proven.The big bang is pretty much the same thing. It's claiming that because some event of the scale of a galaxy-cluster occurred some billions of years ago, that is automatically the time everything began. The chaotic inflation theorists will tell you it was much much earlier, when another universe started, and so on.
Most people who doubt the BBT do not have an understanding of what it really is, or how it came to be, or why the vast majority of working astronomers and cosmologists subscribe to it. Intuition and 'common sense' can't trump the real science.
My intent here was never to get this deep into this subject. There are many good forums available to discuss this in as much detail as anyone could want, Astronomy Magazine's website at astronomy.com is one place where such a discussion could take place. But we have taken this thread far from its intended track and should return there.
Not in an astronomical, or cosmological sense. This is where your lack of understanding of physics is apparent. What you wish to call a universe, is not what science calls a universe.No, universe by definition means everything, including nothingness. If we were to discover an "universe" parallel to us, that would be part of THE universe as well. It gets confusing because a word that literally means "everything" is being used to define a subset of elements in the spacetime dimensions. Naturally, if god existed, he would invariably form part of the universe.



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