Philosopher: 'Since it is impossible to definitively prove the existence of extraterrestrial life, it is therefore impossible to definitively claim that extraterrestrial life does not exist.'
- AThe philosopher assumes that the burden of proof for non-existence is the same as for existence.
- BThe existence of extraterrestrial life is a matter of scientific inquiry, not philosophical debate.
- CIt is not impossible to definitively prove the existence of extraterrestrial life; we just haven't yet.
- DThe absence of evidence is not necessarily evidence of absence.
Show answer & explanationAnswer & explanation
Correct answer: A. The philosopher assumes that the burden of proof for non-existence is the same as for existence.
The philosopher argues that because you can't prove X, you also can't prove not-X. This relies on the unspoken assumption that the same standards or burdens of proof apply equally to proving existence and proving non-existence. However, proving non-existence often requires an exhaustive search, which is a different kind of burden than proving existence, which might only require one instance. Option B directly points out this underlying assumption.
Why the other options are wrong
- B. This dismisses the context but doesn't analyze the logical structure of the argument presented.
- C. This challenges a premise, but the flaw is in the *reasoning* from the premise, not the premise itself.
- D. While true, this statement is more a general principle related to the topic than an identification of the specific flaw in the philosopher's reasoning, which hinges on the *burden* of proof.
Assumption of Equal Burden of Proof
A logical fallacy where an argument assumes that the difficulty or requirements for proving a negative claim are equivalent to proving a positive claim.
- Often related to arguments from ignorance.
- It's generally harder to prove a negative (absence) than a positive (presence).
- The burden of proof typically lies with the one making the positive claim.
Memory trick: Don't just listen to words, hear the silent chords!