I don't even know that there was a Big Bang. I know that some say there was. And they conjecture about it, as to how, what, when and why. But they (and I) don't KNOW that. I do believe, just like Paul wrote, that the composition of stars differ one from the other, same with planets (as we can see from exploration), moons differ from each other, and so forth. You do know, don't you, that Paul wrote that "There are also heavenly bodies and earthly bodies. But the splendor of the heavenly bodies is of one degree, and the splendor of the earthly bodies is of another. 41
The sun has one degree of splendor, the moon another, and the stars another; and star differs from star in splendor." 1 Corinthians 15. So evidently by inspiration, Paul wrote that the composition of stars, moons and other celestial objects differ one from the other.
This is a good passage for learning the difference between how people in Paul's time thought of the universe and how we know it today.
In the time of Paul, there was a distinction made between 'heavenly' bodies and 'earthly' bodies. The earthly bodies were those that were naturally below the circle of the moon. Heavenly bodies were those above the moon. It was thought that the two types of bodies were made from very different things (heavenly bodies were made from 'quintessence', not 'water, earth, fire, or air').
it was also thought that the laws of motion for the heavenly bodies was different than those for the earthly bodies: heavenly bodies naturally moved in circles (around the earth) while earth naturally moved downward.
Among the neo-Platonists (which influenced early Christianity), the 'Prime Mover' was the one that moved the 'primary sphere' that the stars were on. This, then, made the planets move, and, by various processes, made things on Earth move. It was thought that when humans died, their souls ascended through the heavenly spheres to get up to heaven, which was just past that outer sphere of the stars.
Some believed that the prime mover was too separated from humans and so we needed a messenger to come down to help us in our journey up to heaven. So, the prime mover split off a piece of divinity who came down in the form of a man (sound familiar?).
Anyway, the whole universe as imagined by people at the time of Paul was just a couple of billion miles across. the stars were specks of light on a sphere, the planets were bits of brightness on other spheres, etc. The actual nature of the planets and stars was not known. For example, it was not known that the sun is a star.
What we know now is that the laws governing the motion of the planets, stars, and other heavenly bodies are *the same laws* as what govern things on Earth. The heavenly bodies are made from the same basic materials as things on Earth (although stars are mostly made from hydrogen and helium). We know that the universe is vastly larger than a few billion miles across and that the stars are immense globes of gas that are light years away from us.
So, with modern knowledge, the content of Paul's quote loses any real meaning. It was meaningful given the views of his time, but we now know those are wrong. In light of what we know now, the words he wrote now pale in meaninglessness.