Argumentum ad lunam

Cogito ergo sum Logic and rhetoric

Key articles

Logical fallacy Syllogism Argument

General logic

Science doesn't know everything Escape to the future Lewis Trilemma On the spot fallacy Burden of proof Checkerboard rule

Bad logic

Gambit Uncertainty tactic Definitional fallacies Argument from silence Logical fallacy Foxhole atheist v - t - e

Argumentum ad lunam (also appeal to the Moon) is the argument that, "if we can put a man on the Moon", we must also be able to X (usually something really important).

The argument is almost always an informal fallacy and a false analogy.

Form

Bo Bennett raises the following examples:

P: We can put a man on the Moon.

C1: (unstated) We can do anything.

C2: We can end world hunger.

While C1 might be stated differently (if it is stated), its ludicrosity is obvious. Just because you can do one thing, does not mean you can do another (usually) unrelated thing.

There is one (mostly) non-fallacious form of the fallacy:

P1: We put a man on the Moon in 1969!

P2: (unstated) We can do things we've done before!

C: We can put a man on the Moon today!

P2 here seems much stronger — usually, people can do things in repetition. In this case, however, such an illusion falls away with a glance at NASA's budget.

External links

• xkcd's take