Quote:
Originally Posted by GGG
A fourth is that the universe is too large and intelligent life rare enough and the constraints of the universe fixed that communication between civilizations is not possible.
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So if there is life out there, but we have no way of detecting it or communicating with it, effectively we will be alone. Like if a tree falls in the forest merged with Schrodinger's cat, it is then a philosophical question. We can't ever know, and if that is the assumption, does it matter?