Just because scientists may not yet be able to explain every last detail about how the moon was formed etc and we find it puzzling to get our heads round does not make it wrong. It is entirely natural and coincidental. The universe became what it is because of the gases etc it is now known to be made of. And of course if it had happened differently, humans would not have evolved the way we have and the universe would have continued without our observing it. It is 100% chance and coincidence that we exist.
Extra-terrestrials doing the stuff you suggest they might, or could, have been capable of doing would have left some sign, would have had to leave their starting point millennia ago, overcome the speed of light, etc etc and although we can easily imagine all this, I've read arguments that set out the logical reasons why this is as close to impossible as you can get, and these make much more sense I think.Quote
.... And if I cannot answer "how" this means what?
As far as who, I already suggested "extraterrestrials", ....
The theoretical model that suggests the Moon was created by an impact, two impacts no less, by some unknown body is so complex as to be only valid in a computer model requiring a near impossible perfect storm of events.
But whatever was needed actually happened, however unlikely you may think this to be. It's the introduction of the idea of ETs et c that adds the unnecessary complexity.