Argumentum ad verecundiam Wikipedia-logo-en.png For more information, see the Wikipedia article: Argumentum ad verecundiam An argument from authority is one in which a proposition is claimed to be true because an esteemed person says it is true. It is a fallacy in that it relies on the person's fame or reputation, rather than on logical arguments or empirical evidence.
Arguments from authority carry little weight—“authorities”have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that there are no authorities; at most, there are experts. Always ask whether the hypothesis can be falsified. Propositions that are untestable, unfalsifiable are not worth much. (Popper)