On the second day it seems the platform for an expansion of the universe (enclosed by water) was created. Subsequently, passing a couple of time-phase intervals, on the fourth day lights and stars were added (eighth time-phase interval) to it. This is what we refer to as the heaven. After the completion of these steps (intervals one through eight), the crypto-dimension of space-time became potentially recognizable. This firmament, and now heaven, is thought of mathematically as a space-time spread or fabric threaded with the processed, initial and void matter and second division of light that God made. To mention some of its properties, it is able to be transformed (e=mc2), stretched, bent and contracted.
The speed of light can be measured but the speed and distance of the expanse cannot. (For one thing, we don't know the exact time that space may accelerate, decelerate or contract. We can use if-hypothesis equations though.) Therefore, the distance of the borders (the upper waters) is indeterminable, even as in relative respect, the initial mass' void face and depth of the first time-phase. The phenomenon of what scientists refer to as billions of years in reference to age and distance is due to the perception of the cosmic time scale. In scientific measurement for instance, according to a theory of relativity, a clock on earth would not turn at the same speed as a clock at a point toward the distant end of the stars, and hence, the work that God performed in our earth time during the six days of creation could have amounted to years in exponential terms from relative, cosmic measurements. However, Christians should have better and more genesis-cosmologically designed equations.
LINKS:
HAWKING'S “BLACK HOLE” AND “BIG BANG” DEFICIENCIES
They do not promote or reveal the true God, nor formulate the specific days of the creation in regard to movement of time and specific creation
EXISTENCE OF GOD FROM ETERNITY MOVING FORWARD Psalm: 90:2 “Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God.”
MAN IN FUTURE ETERNITY: ACCOUNTABILITY
PSYCHOLOGY
Man knows there is God from within his soul (natural revelation) and through writing (Torah—special revelation): The spiritual things he discovers through nature are designed to agree with God's written message and direction to mankind
Natural Manifestation: Even the wicked and those who repress divinity know there is a Creator from within themselves