Fine-tuning?


How much of this planet is habitable? Without building a boat, plane or platform, we are limited to dry land, and a zone about about 2 m high - and even some of that is not habitable. According to here, the habitable land is slightly over 100 million km2, which is 108 km2 or 1014 m2. The habitable volume is then about 2x1014 m3.


But hey, we will be generous, and suppose mankind can spread across the entire world (5x1014 m2), and build up to a 1000 m up (highest building is 828 m, but still). So there is a living volume of 5x1017 m3 on Earth.

Sounds like a lot, right?

Compared to how much of the solar system we cannot live it, that is nothing.

The nearest star is slight over 4 light years away, so we can safely consider the solar system to be contained in a sphere of radius 2 light years (in fact that stil allows plenty of empty space between star systems). That is nearly 2x1016 m. This gives a volume of:

4/3x3.142x(2x1016)3

3x1049 m3

The percentage of the solar system that is habitable is 5x1017/3x1049 x 100 = 1.7x10-30

Or about  0.000 000 000 000 000 000 000 000 000 001 %.

So the next time someone tells you the universes is fine-tuned for life, ask why the creator was so inept that he only contrived to make 0.000 000 000 000 000 000 000 000 000 001% of it suitable for mankind.

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