The ancient cosmology of the Jews that is reflected in Genesis is very different than what we know scientifically today. It is a religio-mythological interpretation of what was believed back then; it wasn’t science.
First, they believed that God created everything. In the beginning, as it says in Scripture, the earth was without its form, and it was void of everything, until God said “Let there be light,” and then things started to happen. God’s light on the earth (sun) began the process and is recorded in the first chapter of Genesis.
Looking up into the sky, they believed that the blackness of the universe, and the stars which shown through it, was the portal from where one finds God. The stars were like windows from which the light of Heaven shown through to the earth. It was all a solid mass. Then, below that, between Heaven and the earth, was a firmanent, or expanse, like an arch, where one found water and rain, air, demons, etc. The water found in this area was separated from the water found on the earth, which was believed to have come about from vast underground geisers. The earth was the other solid mass upon which everything grew.
At no time did the ancient Jews ever believe that there existed a ‘planet’ for Heaven or Hell, and the postulation of such today by a supposed NASA scientist is way out in left field some where. There are too many scientific problems with that proposal as is outlined.