Do you think that unlike humans, they actually know the meaning of their existence?
Obviously there's now way for us to know, so I'm not looking for facts, just opinions. I myself don't really have one, this is something that I was randomly thinking about while I was half awake this morning.
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I don't believe an advanced extra terrestrial civilization would have found any meaning to existence. In fact, I would say they would have most likely discovered that existence just 'is' and that meaning is nothing more than a condition of the ego through which all sentient beings interpret our universe. There is nothing inherent about 'meaning.'