It’s a thing, but even the creationists debunk it.

The summary is that, ancient people did conceive of the sky to be solid, but the Bible itself never says so in unequivocal language.

One could interpret the word used for “firmament” as being synonymous with the atmosphere and interstellar space and the texts still make sense.

creation.com/is-the-raqiya-firmament-a-solid-dome