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This tag is for Heisenberg's quantum mechanical uncertainty principle. DO NOT USE THIS TAG for uncertainty in a non-quantum measurement.

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If the universe started from a singularity expanding based on pressure, how did physics deci...

Very simplified version of what you may want: Firstly, the universe is expanding constantly. Secondly, we know this because of the Doppler effect, where objects that are further are red-shifted, where …
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