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<blockquote data-quote="Umbran" data-source="post: 6276184" data-attributes="member: 177"><p>Modern physics allows for multiple universes fairly easily. Note that "multiple" does not necessarily equate to "parallel", in the way it is often used in fiction. </p><p></p><p>Our Universe started in a Big Bang. There could have been (some would say likely were, when you review the math) other big bangs that created other universes. These universes are not related in any meaningful way. It isn't like in the universe next door, there's an exact copy of you, with just some minor point of history different, or something. The next universe over probably has a different set of physical constants and/or laws that mean we could not exist within that universe.</p><p></p><p>There's also the "many worlds" interpretation of quantum mechanics, in which our universe branches every time a particle has to collapse into one particular quantum state over another - so that actually it collapses into *all* possible states. In this case, it is like the Universe just next door has an exact copy of you...</p><p></p><p>Note that in both these cases, the universes don't interact. The fact that there's another universe is largely moot - you can't get there from here. The existence of other universes would be something we'd call "non-falsifiable" or not testable. It is allowed by current theories, but we can neither confirm nor deny it. Not just "as a practical matter, we haven't yet figured it out yet", but "we could not, even in theory, confirm or deny it - confirming or denying it is, as far as we know, impossible."</p><p></p><p></p><p></p><p>And even those are noted as having limits. We sometime refer to Newton's Laws of Motion. But they are recognized as holding in Classical physics - meaning for largish objects moving at modest speeds. They don't hold for small objects (where quantum mechanics holds) or for really fast moving objects (where relativity holds). Thus demonstrating that we do alter our beliefs as we come up with more accurate models.</p><p></p><p></p><p></p><p>I may be better at math. But that's only one of many ways a person can be smart. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Umbran, post: 6276184, member: 177"] Modern physics allows for multiple universes fairly easily. Note that "multiple" does not necessarily equate to "parallel", in the way it is often used in fiction. Our Universe started in a Big Bang. There could have been (some would say likely were, when you review the math) other big bangs that created other universes. These universes are not related in any meaningful way. It isn't like in the universe next door, there's an exact copy of you, with just some minor point of history different, or something. The next universe over probably has a different set of physical constants and/or laws that mean we could not exist within that universe. There's also the "many worlds" interpretation of quantum mechanics, in which our universe branches every time a particle has to collapse into one particular quantum state over another - so that actually it collapses into *all* possible states. In this case, it is like the Universe just next door has an exact copy of you... Note that in both these cases, the universes don't interact. The fact that there's another universe is largely moot - you can't get there from here. The existence of other universes would be something we'd call "non-falsifiable" or not testable. It is allowed by current theories, but we can neither confirm nor deny it. Not just "as a practical matter, we haven't yet figured it out yet", but "we could not, even in theory, confirm or deny it - confirming or denying it is, as far as we know, impossible." And even those are noted as having limits. We sometime refer to Newton's Laws of Motion. But they are recognized as holding in Classical physics - meaning for largish objects moving at modest speeds. They don't hold for small objects (where quantum mechanics holds) or for really fast moving objects (where relativity holds). Thus demonstrating that we do alter our beliefs as we come up with more accurate models. I may be better at math. But that's only one of many ways a person can be smart. :) [/QUOTE]
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