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No life is out there, so we obviously cannot measure its intelligence.
After over 40 years of operation, SETI has absolutely nothing to show for its consumption of resources.
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Maybe they’re so different or so far advanced that we wouldn’t even recognize their existence, or have any way to receive their signals.
Some people have suggested that there may even be intelligent life forms on our own planet that we simply don’t recognize. They could be ‘invisible’ to us, at this stage.