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Correct me if I'm wrong, but it is my understanding that tides are caused by the Moon's gravity, and gravity is a function of mass and the square of the distance. Thus a much smaller moon closer to Earth could exert the same gravitational effect of our Moon. For instance a moon that has a mass...

I agree. The problem is that any measurement has a margin of error, no matter how small, so I'm afraid it's impossible to prove with certainty even that space is flat, and in any case, as you wrote, anything far beyond the observable universe cannot be verified or falsified.

Hello. This is my first post on this forum so I'm choosing a 'light' topic... I have often thought that maybe we are just part of a video game, with the alien version of a teenager playing SimUniverse II, or Planet Maker IV ;) On a more serious note, I always felt quite skeptic about the...