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RE: Are we alone in the universe? Or it isn't that so?
Thank you, I appreciate you comment. Interesting details!
This topic is very close to the theme of "filters" in the Fermi paradox,
but that's a subject for separate discussion!
I'm a sci-fi writer. I try to keep my science real. Lately I've had occasion to research 'extinction events' (earth has had at least five and possibly as many as twenty) When Toba blew (many gigaton) it was no big deal....compared to one of the extinction events.
People don't seem to have any idea of scale. The biosphere of earth is as relatively thick as a film of water on an apple. (about ten miles vs about 8K miles)