You're very kindly @A.B. , I've asked days ago about ancient eukaryotes on the main site. On the other hand, my question about the nuclear armageddon that our our species can to cause, for me this is a nonsense: my belief is that nuclear power is a
it's a discovery, a tool, to explore our solar system (in special its edge), the rockets can safely leave and return to a planet's atmosphere, but not beyond.