Skywaters

Mythical firmament of water above the earth that makes the sky blue. A literal translation of the Hebrew word שָּׁמַ֖יִם 'shamayim', usually translated as 'heavens' in English Bibles. Most notably used in Genesis chapter 1, in the first of the two creation stories included in those early chapters. Of course we now know that above the sky is space, but in space there are great expanses of gas and dust in the nebulae that form stars and galaxies. So 'skywaters' is still a fun and useful word to describe stuff up there that we don't quite understand.