"For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts." (Isaiah 55:9)
Since God's ways are infinite and His thoughts utterly beyond human comprehension, this verse tells us plainly that the height of the heavens is also infinite.
This means that modern relativistic cosmologies that involve a finite universe, or bounded universe, are bound to be wrong. They are all based on esoteric mathematical models, not on measurement or observation. Space is as far beyond our mathematical comprehension as is God Himself. Our minds, operating in space as they do, cannot even comprehend the idea of an end, or limit, to space. What could be beyond any supposed boundary of space, except more space?
This fact also means that speculations about the location of the center of the universe are pointless. It is impossible even to define the center of infinite space. Any point could, with equal geometric propriety, be chosen as the center, since space extends infinitely in all directions from that point!
In the eternal ages to come, however, the new earth can at least be defined as the center of God's interest in the universe. The holy city will rest on the earth, and "the throne of God and of the Lamb shall be in it" (Revelation 22:3).
Meanwhile, we can rejoice that such an infinite God is directly concerned with each of us. It is absurdly foolish for us to question Him, or His ways, or His thoughts. What He does is right, simply by definition! It is our great privilege simply to believe and trust His word and His ways. "O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out! . . . For of him, and through him, and to him, are all things: to whom be glory for ever. Amen" (Romans 11:33-36). HMM