3 ms·
One can always posit possible causes, but is there evidence for any of them? For example, is there evidence that, two billion years before the origin of life on
by mannykannot 6y ago
One can always posit possible causes, but is there evidence for any of them? For example, is there evidence that, two billion years before the origin of life on Earth, radiation levels throughout the galaxy were such as to prevent the same thing happening anywhere, or that nowhere in the galaxy could there have been the chemistry which was vital for the emergence of life on Earth?
- joe_the_user 6y agoAnything to do with the Fermi paradox is going to be very broad speculation. We're discussing the probability of X thing happening when have exactly one instance available.
- marcosdumay 6y agoYet, here we are without even a reasonable speculative explanation. Your #1 is against all the evidence we have. And we have quite a bit of it. Your #2 is a well discussed possibility, but we have evidence of life evolving on Earth from very simple creatures. So placing a severe ceiling on the complexity of that panspermy subject, and removing most of the power from that hypothesis. Granted that it's still a possibility, but we know that nearly all of our evolution happened here on Earth, on roughly the same time that was available for those very simple organism to appear. Your #3 is literally begging the question.