God made the expanse, and it separated the water which was below the expanse from the water which was above the expanse. And it was so.
It is generally accepted that there are seven firmaments, named as follows:
Vilon (the brightest of all), Rakia (where the sun, moon, stars, and planets are found), Shechakim (the source of mercy in the world and where the manna is stored for the righteous in the World to Come), Zevul (it is guarded by the angel Gavriel and contains the “Upper Jerusalem” and Supernatural Temple), Maon (where myriads of angels sing praises to God all night long), Machon (which contains chambers, fires, evil clouds, dew, hurricanes, tornadoes, and poisonous waters) and Aravot (which contains life, peace, blessings and success, the souls of the righteous unborn and those who successfully completed their worldly journey, and good dew with which the dead will be resurrected).
Above all these firmaments are the four chayot, angels.
Above them is a firmament that illuminates all the others.