We can see Oumuamua and posit it’s a spaceship
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There is an interesting video that takes what is known scientifically and determines it was actually a light sail.
https://www.youtube.com/watch?v=uZ5EHX8OT3k
Any sufficiently developed space-fairing civilization’s tech would appear like magic to us. Notice I did not say ‘alien.’
“Notice I did not say ‘alien.’”
This is exemplary.