firmament

(Latin: firmamentum, support)

The vault of the heavens. The idea of firmness in the sky is due to the Hebrew word which stresses the notions of solidity and expanse. The biblical narrative, which describes the physical universe in a popular way, shows the firmament to be a strong ceiling that divides the waters above from those below; it serves, too, as a support for the heavenly bodies (Genesis 1).

New Catholic Dictionary

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