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[–] ThatFnGuy 0 points 2 points (+2|-0) ago 

Genesis 1:6

And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

"Firmament" and "expanse" are interchangeable, depending on the interpretation. Firmament could be the dome, could be the atmosphere. Bible states that the waters above the firmament are the heavens.

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[–] Six_Cents ago 

I believe that the firmament was an extremely dense atmosphere covering the planet. In my mind, this would explain a couple of things;

1) Why people lived so much longer before the flood than after the flood (Genesis 6:3). The firmament blocked out virtually all of the harmful radiation from the Sun.

2) How it could rain for 40 days and 40 nights (Genesis 7:11).