Do all possibilities exist?

Yes, all possibilities exist. Now, is everything we think of possible right this moment? No, not at all. With time, it is obviously very possible. Think of it in this way, 3,000 years ago, if you lived back then, going to the moon was totally out of the question! Just imagine it. The point is that no matter what we think of, it will be possible at some point in time. It may be right after you die or it may be hundreds or thousands of years after you die. If some possibilities we think of are actually not possible, then, why do humans exist? Humans are here to explore. "If you tell a man not to go over the mountain no matter what, he will go over that mountain!" It is our urge to explore and discover - that alone can lead you to the conclusion that everything is possible.
 
In my opinion, it would be a mistake to assume that the mere existence of infinite universes implies that every possible universe exists. The numbers 1, 2, 3... are infinite, yet do not contain 1.5. Similarly, even if you believe that every decision point is played out both ways (or spawns a new pair of alternate universes) it seems probable that there are states that are possible but never reached.
 
Originally posted by zak
In my opinion, it would be a mistake to assume that the mere existence of infinite universes implies that every possible universe exists. The numbers 1, 2, 3... are infinite, yet do not contain 1.5. Similarly, even if you believe that every decision point is played out both ways (or spawns a new pair of alternate universes) it seems probable that there are states that are possible but never reached.
The point is that what is observable is finite. This is the key. If what we can observe is infinite, then your analogy holds.
 
The point about gravity is well made - it is a weak force compared to all other forces and appears to act instantaneously over the universe and has so far proven to be impossible to link into qunatum theory.

There has been much speculation into other dimensions (other than the four we can directly observe) and all these theories and ideas point to other dimensions containing other universes - which we cannot observe. However another possibility is that beyond the boundary of our observable and expanding universe there are other expanding universes - like bubbles in a vast liquid. This seems plausable assuming that space/time really is infinite.

How we could ever prove the existence of other universes is another question ;)

Or maybe the idea that the different dimensional universes occasionally intersect and when this happens all manner of strange phenomena arise (this is one possible idea for ghostly activity) is true...then perhaps someone could devise a device which could be carried into the other universe...hmmm
 
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