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how do you explain moon phases with a disk? also how would a thin disk have enough mass to pull water from the earth?

A flat Moon made almost entirely of iridium could have the Moon’s actual mass if it were about 350 km thick.

And could perfectly hide the secret nazi base on it's back. ;-)

But it would promptly deform into a sphere, since its yield strength isn't remotely high enough to withstand the pressure of its own gravity

These sorts of people do not math.