Start 2019 off with vintage “why They never write, never phone” stuff. In this scenario, They are all dead due to climate change:
For Earth, intelligent life took roughly 4 billion years to evolve, says Kane. But he notes that there is a large range of stellar ages for the exoVenus host stars he and colleagues have discovered. And they lie mostly in the one to ten billion-year range. So, Kane thinks that many of these Venus-like planets will be more than 4 billion years old and could well have evolved intelligent life on them at some point. …
Would alien civilizations living on their own Venus-type planets be helpless in staving off this inevitable climate change? Or could they geo-engineer their way out of an eventual runaway greenhouse?
If so, Kane says it would need to be a coordinated planet-wide effort. Bruce Dorminey, “Galaxy May Be Littered With Dead Aliens Blindsided By Natural Climate Change” at Forbes
Funny he should mention “a coordinated planet-wide effort” just now…
Planetary astrophysicist Stephen Kane thinks the overheated Venusians would be better off to just find another planet than try to engineer less Venus. We can argue about it when we find the detritus of their civilizations, right?
See also: SETI finds more creative ways to keep looking. As long as there’s an Out There, They’ll always be Out There, of course.
SETI reacts to the study that says not to wait up for the extraterrestrials
Researchers: We have dissolved the Fermi Paradox!
Extraterrestrial civilizations: When all else fails, try Bayesianism. The good news is, no one can ever prove They’re Not Out There.
and
How do we grapple with the idea that ET might not be out there?
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