As CS Lewis states, 99% of what we “know” is based on “argument from authority”.
Do you know that the Arctic is cold? How? Have you been there, or are you basing that knowledge on “authority”?
I know the Arctic is cold because numerous thermometers have measured the temperature, not because someone told me it's cold. I don't have to go to the moon to know it's gravity is 1/6 that of earth. The fact that someone famous says it's gravity is less isn't what convinces me, it's my knowledge of physics.