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Old 21st August 2019, 06:32 AM   #6
3point14
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Join Date: Nov 2005
Posts: 18,375
My assumption is that, for life, an earth sized planet in the right zone is required. Additionally, I believe that the planet requires a moon in almost exactly the same spot as ours is, carved off in exactly the same way as ours, in a large impact that peeled off a load of planet to make a moon.

I believe that life can only exist toughly this far out from galactic centre and absolutely requires at least two gas giants sharing the orbit to protect the poor little rock from asteroid collision.

I believe that all of these things and many more are required for life to even be a possibility and that the earth is all but unique in producing life.
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