Encompassing the Whole World Front Page /// Constants /// Site Index

D

The constant D is the number of spatial dimensions in our world, and as you would expect, it's value is 3.

So why does this value matter? Because with a higher number of dimensions orbits become unstable, which not only means that planetary orbits don't last, but also means that electrons can't orbit atoms, stopping chemistry from working.

This is a problem because due to it changing square laws to cube laws.

With a lower number of dimensions, you can't network things properly, so you can't have a digestive tract down the middle of a creature, and blood and electrical impulses can't be wired up properly.

A clear and detailed explanation of why it must have this value is given in the book Just Six Numbers by Martin J Rees.

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last modified 22:48 2005/08/08