> Unless 'it' left a long time ago and is already here. Might be posting on HN right now. Never know. All your hypotheticals are not entirely unreasonable, bu

> Unless 'it' left a long time ago and is already here. Might be posting on HN right now. Never know. All your hypotheticals are not entirely unreasonable, but they are also so far beyond our current ability to test, that it becomes pretty futile to speculate, except as a source of entertainment. Space is reaaaaaaaaaaaaaally big, much bigger than people really have a conception of. Bigger than I have a conception of, and I try really hard to understand how bad my conception of it is. A space fungus from 120 light years away would presumably only reach us by almost 100% chance, which is something I am comfortable saying is almost 100% unlikely. This is true of most hypothetical threats. Fantasies about aliens or AI coming here (or sending big rocks) to exterminate are as weird to me, as I image "space is big haha" is to you. There is no reason for anyone even to try to cross interstellar distances, especially not for war. The expected gain will never be worth the cost, outside of some fantasy FTL-for-free engine, which is just that: fantasy. But, it is fun to think about it all.