how many universes are there?

Answer 1

There is insufficient information at this time to answer this question; many varying and conflicting theories and hypotheses exist, however, many of these even vary among interpretation (for example, the unified 'fundamental theory of physics,' m-theory, can be interpreted to call for infinite universes, or a seemingly arbitrary but set number). The word universeetymologically implies only one, which has led to the term 'multiverse' to refer to a collection of universes. This, however, deals with very theoretical branches of theoretical physics, and is so subject to interpretation it can hardly be called science more than 'educated guesswork.'

Answer 2

very good question.

 

You see, there isn’t any evidence of the multiverse existing, but there are a lot of theories about the number of universes, one of which is the MWI interpretation.

 

The many-worlds interpretation (MWI)

This theory mostly follows quantum mechanics.

 

The MWI is an interpretation, or explanation, of the fact that there is more than one universe; this also follows the same theory as Schrödinger’s Cat.

 

The MWI is better explained by Hugh Everet, who was a physicist at Princeton University. He explains that the universal wavefunction (same as the MWI) is objectively true,saying that there are objectively infinite worlds that have a barrier of communication; sometimes these worlds are called "Everett worlds" because of the physicist’s idea. Everett proposed this because of quantum decoherence, a process in quantum mechanics that explains the idea of infinite universes. But several authors call this a theory because, as Everett says, it is "the only completely coherent approach to explaining both the contents of quantum mechanics and the appearance of the world[ referring to calling it a theory]." Hugh also says that the multiverse is composed of quantum superposition, another reason to call this a theory rather than a fact. This theory is applied in quantum mechanics, but there is one very similar: the theory of "decoherent histories", in which every history follows classical probability but also follows the Schrödinger equation.

 

Conclusion

If one goes by the MWI, decoherent histories, or quantum superposition, the idea of infinite universes or the multiverse is true, although this has no evidence. Science has lots of theories, so this has a probability of being true, so yes, there is (or there probably is) more than one universe.

Answer 3

The current scientific consensus is that there is only one observable universe, which is estimated to have a diameter of approximately 93 billion light-years. However, there are various scientific theories and hypotheses that suggest the existence of other universes beyond our observable universe.

One such theory is the multiverse theory, which suggests that there may be multiple universes or even an infinite number of universes existing alongside our own. However, the existence of these other universes is still a topic of active scientific research and debate, and there is currently no direct observational evidence to support their existence.

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Answer 4

Since the Universe is so vast and complex, one might assume that other Universes exist. There is only one Universe we currently know of, and that is the Universe in which we already live.