3 ms·
Well, it would seem to have occurred only once in all the universe we've looked at. That's as rare as it can be, given the anthropic nature of the observation.
by fergalish 7y ago
Well, it would seem to have occurred only once in all the universe we've looked at. That's as rare as it can be, given the anthropic nature of the observation. :)
Statistically speaking... as in mean civilisations per galaxy, yep I agree, no idea where that might land!
- varjag 7y agoOutside solar system, we can hardly observe anything but supercivilizations as we conjecture they should be. In our solar system, non-sentient life is still not fully excluded on Mars, and there is a reasonable chance of finding something on Europa, Titan or other big moons. In the galaxy overall from what we know now about occurrence of planets in habitable zones, there likely should be tens of million earthlikes with a substantial sized moon.