Warp schrieb:
> 
>   A moon which causes tides, and plate tectonics also help in the process
> of life forming. Even if a planet is otherwise ideal, if it lacks those,
> it will be much less likely for life to form.

This is something that I find particularly intriguing about the place we 
live on:

Not the fact that the earth does have a moon. Nor the fact that it is 
the only one the earth does have. Not even the remarkable fact that it's 
  an incredibly huge chunk of rock for such a small planet.

No, what's most astonishing about this all is that its apparent size 
matches so well with that of the sun.

I can only think of two possible conclusions for this:

(a) It may be due to the anthropic principle, i.e. there might be some 
hidden mechanism in the creation of intelligent life that requires this 
extraordinary property.

(b) It was /designed/ to be this way.

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