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For example: Why is the Sun hot? Because it's the Sun. Why is the grass green? Because it's grass.

Mark
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    Do you mean like in "Why do n00bs ask daft questions?" – Mick Oct 28 '16 at 15:27
  • This is just sarcasm - the answer isn't really in the question. The answer to "why is the sun hot" is "because it's undergoing nuclear fusion". – John Feltz Oct 28 '16 at 15:32
  • Your examples are inadequate. The sun is hot for other reasons (hydrogen, explosions, etc) and an astronomer can explain it better than I. Grass is green because it has a green pigment called chlorophyll. – Centaurus Oct 28 '16 at 15:33
  • Please rephrase your questions and give good examples. – Centaurus Oct 28 '16 at 15:34
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    Ughhh. These questions should just be deleted. Why even bother?? – Lambie Oct 28 '16 at 16:00
  • I think you're really asking, "Is the sun the sun?" But let's turn that into a statement: "The sun is the sun." The logical positivists argue that no proposition, other than a tautology, can possibly be anything more than a probable hypothesis. So that statement is cognitively verifiable or--the truth. – Zan700 Oct 28 '16 at 16:34

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You might call this a tautology:

the saying of the same thing twice in different words, generally considered to be a fault of style (e.g., they arrived one after the other in succession ).

synonyms: pleonasm, repetition, reiteration, redundancy, superfluity, duplication

"avoid such tautology as "let's all work together, everyone, as a team" by saying simply "let's work together""

a phrase or expression in which the same thing is said twice in different words.

See also: circular reasoning

Kevin Workman
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self evident:

evident without proof or reasoning (Merriam Webster)

clear or obvious without needing any proof or explanation: Solutions which seem self-evident to humans are often beyond the grasp of computers (Cambridge)

grateful
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These are circular answers. Circular meaning "referring back to itself" or "leading back to itself".

Circular answers are an example of circular reasoning or logic: the answer follows from the question, but the question also follows from the answer.

J. Siebeneichler
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