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Originally Posted by phonicboom
Am I closer to the size of a photon or the size of the sun?
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According to Quantum Mechanics, I think you are closer in size to the Universe, as it assumes photons to be points, while we think the Universe is finite (at least the visible universe). That is, you can fill more photons in the volume of your body than we can put yous in the Universe. String Theory, and others, might disagree though.
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Could dimensions be elementary particles?
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Maybe, depending on how you mean. String Theory tries to model elementary particles as different vibration patterns in non-spatial dimensions.
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Is everywhere in space equally dense, but due to our perception it appears blobby?
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The Universe appears to be isotropic on large scales. So, yes.