i dont see how you can prove that it is impossible that all the scientists have been wrong and that in fact the sun is not much bigger than it appears to us. its unlikely, i dont believe it myself, but it is a possibility. and even though it might be absolutely true that the sun is bigger than the earth, you cannot be absolutely certain thus i believe you cannot absolutely know it.
and indeed weve kinda strayed to epistomology and its only indirectly relevant to morals, or better said to the issue if we could ever make an objective claim, which includes the claim of an objective morality.
i think it could best be explained that an absolute truth is a truth which is both universal and eternal. universal truth would mean true for everyone at a given point and eternal truth would be a truth that is always true. and if you would combine such a truth you would get an absolute truth which is always true for everyone.
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