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How is 2 + 2 a fact?
How do you know, through new experiments and observations, that we will never determine the exact age of the moon?
You have 2 apples. I give you 2 more. How many apples do you have? Unless you redefine what the numbers or the operators mean, then you now have 4 apples. That's a truth that is evident in the world and can be verified. That's what a fact is.
He didn't suggest we could never determine the age of the moon. He said that science refines it's methods and gathers new information, and so we may change our estimate of its age based on new evidence.
Maybe the person who isn't you that I asked can weight in because I didn't ask you about your comments context.