The third heaven is the dome or firmament, which is a sea of glass. It's a rigid crystalline sphere on the edge of space which formed in response to the creation of gravity on the second day.
The distance to the firmament (heaven), from the center of the Earth, is approx. 1,736,441 light years. But we (that's me and the Holy spirit) would appreciate it if someone would check our math.
The Hebrew word translated as "firmament" is raqia. A simple definition is "expanse" so most translations render the meaning as "the expanse of the sky."
<< Previous | Next >> Job 22:12-14 Is not God in the height of heaven? and behold the height of the stars, how high they are! And thou sayest, How doth God know? can he judge through the dark cloud? Thick clouds are a covering to him, that he seeth not; and he walketh in …
One of our favorite ways to study the Bible is to follow a doctrine through from the first time it's mentioned to the last. This is a great way to develop understanding of the doctrine in the broad narrative of scripture.