It may have existed long before the creation of what we know as the universe. We are not including it in our present discussion of creation. We know very little, if anything, about these in the original creation. This we know little about also. It was the other part of the world order that perished.
World order involves both the heavens and the earth.
Satan was there, so we can be assured that he had something to do with the overthrow. All these should be looked up and considered. In this are Princes, both good and bad, as well as angels of both categories. He is the prince of the powers of the air. John saw a door opened into this place and saw the temple of God there and the ark of the testimony.