Note that nothing in the written Word of God, also called the Bible, contradicts that there could have been civilizations on the earth long before the creation of Adam only about 6,000 years ago...
That is just not so.
The Word of God is specific: There was no earth at all until day 3. The primal water and the firmament of His powers were created in the beginning, out of which all things were made in their present form in six ordinary days of evenings and mornings. There were no stretched out "heavens/ sha-mayim" until day 2, and they were not even named until after they were stretched out between the cut in two waters of creation on day 2.
God named the stretched out heavens "two waters", as in "cut waters". The pictograph sign for the shin element in the primal Hebrew was written as the two front incisor teeth, which gave the picture of how God separated the waters by "cutting them in two".
The firmament of His powers were stretched out in layers between the cut in two primal waters, and there were no heavens "out there", until day 2..
Stars are called sons of God, and are each named by God, and the stars were not "out there", filling the stretched out heavens until the heavens were stretched out.
In the Word of God Stars are not great burning furnaces, but powers, with personalities and each is named by God. There are the same number of them as there were created in the beginning, for the Word says "not one has failed". They are servants of God and set in the stretched out heavens to control the seasons of this created earth and to run God's heavenly calendars, and to show the signs for His appointed times in the heavens and they send the electro magnetic waves of their powers to the sun, which then governs that light by day, and sends its light to the moon, as God ordained it to do, in the ordained measures controlled by the ordained path of the sun and the moon.
Its a supernatural creation, supernaturally run, supernaturally sustained, and all things are upheld by His powers, for He holds all things together.
And BTW: in the Word He tells us "He has set His tabernacle in the sun".
In the Word of God the sun is not a star, but the word used for it by God, in the beginning, means "menorah", and as such, it receives that which is poured into it by electro magnetic waves from the stars, and refracts it back out, as the governor of that light, to the entire heavens. From one end of heaven to the other, it runs its race like a giant, daily, in its ordained path, as it circles the earth in the circle of the revolving heavens.
Douay Rheims, Psalm 19:
5 He hath set his tabernacle in the sun: and he, as a bridegroom coming out of his bride chamber, Hath rejoiced as a giant to run the way:
6 His going out is from the end of heaven, And his circuit even to the end thereof: and there is no one that can hide himself from his heat.
The Word of God shows us that the entire creation is all centered right here, on this globe that was created as primal waters and the firmament of His powers, out of which waters the elements were called to stretch out, to "form" into the " dry", which God named "earth", and out of which waters the elements were called to form all diverse creatures that are in them, and all that flies in the face of the heavens, and out of the earth, itself, which was formed out of the waters, then, all that is in it and on it was called to "form"; to come forth from it in the diversity of life that God made out of it.
Adam was the crown of creation, and made in bodily form, in the very image of God who made him and who was to come in that same bodily image Adam was created in, as Genesis 1:26-28, and Romans 5:14, clearly state.
Adam was created to rule and govern this center of God's creation as the firstborn human being son of God, made to rule the earth as the "god" of it; and Adam was taken by God from the earth below and set in the third heaven above the earth, in Paradise on Mount Eden, to govern everything on earth and in the seas and in the air, from Mount Eden, in the third stretched out heaven, stretched out from the earth, between the cut in two waters of creation...
and the stars in the heavens were set to help the Adam creation, and to serve the Adam, for God.
Now God the Word is come in flesh of second creation, as Kinsman/Redeemer to the dead in spirit seed of Adam and the sold into sin and corruption creation, and to restore all things when He takes His great power to Himself as the High King and High Priest of earth, and rules from the throne of God set in Mount Eden, in the third heaven. And in that second creation human being flesh, God the Word, the Creator of all things, is to be called "the God of the whole earth", which He redeemed in flesh made like Adam, but without sin, and with the New Man name [that name is Israel; Isaiah 49]. In that name, God's plan for this creation will go on forever, for He formed that flesh to "Plant the heavens" with the sons of God of human being flesh who will be glorified and be stones in the temple not made with hands....
That was the purpose for the creation of this earth, so that God would get human sons to build His temple for His glory to indwell.
That cannot happen in the dead Adam flesh, but in the New Creation human being flesh, named "Israel", not "Adam", His glorious temple will be built and the heavens will be planted with those sons of God of the human being kind....
His plan goes on forever, and He has always had one, and only one, plan.
There was no prior creation to this one.
Isa 51:16
And I have put my words in thy mouth, and I have covered thee in the shadow of mine hand, that I may plant the heavens, and lay the foundations of the earth, and say unto Zion, Thou art my people.
Rev 3:12
Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name.