"Sunset on Mars is blue."

Is this statement grammatically correct. Of course there is also the concern if accuracy/logic overrides grammar.

closed as unclear what you're asking by Cascabel, Dan Bron, Mari-Lou A, Skooba, Davo Jan 18 '18 at 22:53

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    The statement seems grammatically correct. It is likely, however, to be inaccurate. A statement can be grammatically correct but factually wrong - which of those is important depends upon what you want. I do not understand the purpose of the question. – Lee Leon Jan 16 '18 at 8:12

There's grammar, there's semantics, and there's the observable world.

Only grammar and semantics are important to communicate in a language.

If I break grammar (The dogs is work hardly) it will be hard or impossible to understand what I mean.

If I break semantics (Colorless green ideas sleep furiously - Chomsky) it will be hard to assign any meaning to the sentence at all.

But when I make a statement that is simply false, I can do so in a way that my audience understands me perfectly well, so from a language point of view, the sentence can be fine.

If your suggestion that false statements are grammatically incorrect were true, one could wonder how children, who learn the grammar and semantics of their native language in a very effective way, would be able to tell a lie. After all, they learn that grammatically wrong sentences may not be understood at all, so if a lie would be ungrammatical, nobody would understand what they weer saying while telling a lie.

  • Thanks -- your answer makes sense though a wee bit convoluted. – Louisa Chan Jan 16 '18 at 8:22
  • The earth is flat is flawless grammar, garbage science. – KarlG Jan 16 '18 at 8:38

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