What is the firmament of Genesis, and what is it made of?

The firmament is described in Genesis 1:6-9, taking up the whole second day, and to understand it you must understand day one. God first made the earth, a tiny seed about four thousand miles in radius, surrounded by a vast spherical mass of water called 'the deep,' initially frozen as ice, with a radius of about six billion miles, big enough to be used to make the rest of the universe. The great light of day one, far larger than the sun, travels around this ice ball melting it to liquid water within twelve hours. Then on day two comes the firmament. The Hebrew word is rakia, which can mean something solid or something ethereal, and that is the key: the firmament is hydrogen. At very low temperature and high pressure, hydrogen becomes a solid black metal, and this solid firmament holds back the melted water; then, agitated by pressure and temperature, it sublimates and explodes into gas, thrusting most of the water out into space, which becomes the heavens, leaving only a couple of miles of water on the earth. This is why day two is the only day not called 'good,' because the firmament had only done half its job; the second half was to fill all the heavens as the gaseous medium into which the celestial bodies would be set on day four, which is why Scripture says they were put 'in' the firmament. And this is confirmed today, because we find hydrogen and water everywhere in space. The word for 'made' here is asah, not bara, meaning God made the firmament from something else, namely the hydrogen thermolyzed out of that original water.