Gravity was created on the second day. Matter space and time existed before gravity was created. This has profound significance for theoretical Physics but we're going to ignore that for now.
Most of the space between the firmament and Earth is the cosmos or observable universe. There's something very odd about the cosmos: there's a disconnect between what we can see vs. what we believe about it.
The third clue that helps us to deduce the creation of gravity comes from a verse in Proverbs 8. It's part of a passage which runs from verse 22-31 and is a synopsis of the account of creation.
The second clue to deducing the creation of gravity is from Genesis 1:6-8. Now for the first time creation has an orientation. This theme continues throughout scripture. Under and above are synonyms for up and down.
Given that the apostle Paul specifically refers to something called the third heaven it's not a stretch to conclude that there must also be a first and a second heaven. We need to know what they are.
There's a lot of contention among Christians. We think that our take on a doctrine is right, and anyone who doesn't agree is wrong. It spills out into social media and it makes us all look bad.
They key to understanding the inception of gravity as the creative act of the second day is the synchronicity between stretching out the heavens and establishing the foundations of the Earth. One command did both.
David says, " I shall go to him, but he shall not return to me." This is taken to mean that David will one day go to heaven to be with the child, whereas the child, in heaven, can't return to the Earth.
The eternal torment referred to by the Bible doesn't take place in hell, which is temporarily in the center of the Earth, there's another location: a lake of fire and brimstone in outer darkness.
Who descended and what are the lower parts of the Earth? Fortunately this isn't a mystery and we've already done the work needed to resolve both issues.