54 - String Theory Part 1: What Is It?
Why This Universe?
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The Force of Gravity Is a Non-Renormalizable Force
Gravity seems to be a non-renormalizable force, at least if we consider things that are point-like. A single photon or electron shouldn't be able to exert an infinite gravitational force. In string theory, the fundamental objects that are found in our universe are not point-like particles. Instead, they're objects with a finite spatial extent.
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