Why do we say ‘The earth’ and not ‘An earth’?

As I understand, noun which is singular and start with vowels, we put an article “an” in front of it. ( e.g an eye, an ear )
But why it is not “an earth” and why “the earth”?


You seem to be mixing up two rules here.

We use an instead of a when the next word starts with a vowel sound. Indeed, ‘a ear’ would sound clumsy, so we say ‘an ear’.

We do not use an instead of the; the English have no problem at all saying ‘The ice is thick’ or ‘The ears of a cat are fluffy’ (in fact, I would be hard-pressed to find a sentence with ‘an ice’ in it, since ‘ice’ is a mass noun).

The distinction between a / an and the is well explained in the other answers.

Source : Link , Question Author : Ronald , Answer Author : Sanchises

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