Not unless you really thought we'd wandered out of speculative territory and I had evidence of a galactic civilization.

When I said "I don't doubt," in my mind, I was thinking "we don't know enough either way, it's entirely plausible."

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"Where the telescope ends, the microscope begins. Which of the two has the greater view?" - Hugo

"Men occasionally stumble over the truth, but most pick themselves up and hurry off as if nothing had happened." - Churchill