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Chase

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Let's say we took a 1cm^2 region of space, how many unique points of space does this region have? What distinguishes one point in space to another point? Is there a fundamental limit as to how small the distance can be from point a to point b?

I heard Planck length being thrown around a bit but I don't really understand it, is this the smallest physical distance that can exist or just the smallest physical distance we can measure? Basically what I want to know is if you take two points on a straight line, how many unique points exist between them?