I don't know
I know it's difficult to comprehend just how long a time several billion years is, and how big the universe it... but it still seems spectacularly unlikely that life should arise at all, let alone in two separate instances.
And yet, here we are.
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The Coast Of Yemen, Thu 5 Feb 2009, 8:55,
Reply)
Hmmm...
I'm torn between both of those thoughts.
I think though, looking at our history - we'd be exceptionally arrogant to think that we're the only planet.
We thought for a long time that life couldn't exist on our own planet in some environments and we were dead wrong.
Seems life is a lot more resilient than we think it is.
(, Thu 5 Feb 2009, 9:42, Reply)