Quote:
Originally Posted by Alpha_Q
There may be evidence right in front of our face, but we can't see it, detect or even imagine it existing. We look for things that we can think up, like these probes and spheres you mention, but 'they' may have used something that is just beyond or imagination or technological understanding. (pretend that we live on an island circa 5 thousand years ago; perhaps we'd imagine an advanced civilization from the past visiting our island in fancy boats, as we wouldn't be able to imagine them using aircraft.)
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Totally true as well, one of the proposed solutions to the paradox; they are so advanced and/or different that we can't know them.