1. How can the Earth be so perfectly suited for life by coincidence?

Comment #99497 by bexmex on December 16, 2007 at 8:23 pm

Firstly, the earth is only one tiny planet in the great universe. We do not know at present what the scientific odds are of "life." It might be incredibly common, or incredibly rare. We see life all the time in incredibly inhospitable places... there's no reason to believe we're the only ones.

However... the general stability of the laws of physics is a bit trickier. There's a new-ish theory in quantum physics called "retrocausality," or the idea that time travel is quite ordinary:

http://bexhuff.com/2007/03/retrocausality-time-travel-and-quantum-physics

After the big bang, the universe could have formed any number of ways... the vast majority would have led to a highly unstable universe. If the weight of the electron was a tiny bit different, Hydrogen atoms would not exist. The universe would be a boiling cauldron of chaos.

This new crazy theory is that we live in a "self tuning universe," with particles going backwards in time to adjust the big bang to ensure a more "stable" universe... one in which suns warm planets, ice floats, and clusters of self-replicating water bags of low entropy (aka life) is possible.