This is really a 'Life in Space' topic, or so it seems to me.
And as to how does life start on any particular planet? One thing it seems to require is vastly different conditions to those found on our world today. Over the last billion years or so, photosynthesis has changed our atmosphere into an oxygen rich environment; abiogenesis doesn't seem to happen in such an environment. That is why we don't see life emerging today on our world.
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