Universe extends infinity in all directions. It is impossible to determine the exact range, nature and orientation of the universe. Because the human brain can imagine whatever they hear and whatever they see only. Thousands and thousands of galaxies are spread all over the universe and earth is only a negligible member of one of these galaxies. Even the scientists didn't capable to explain about our galaxy completely then how could they imagine others. Either human eye or a powerful telescope can't give that ultimate view of this universe.
Then how the great sage could describe the universe with its perfection and glory because they saw the totality without illusion, they saw the entire universe through their inner eye. So close your outer eyes because whatever you see through your dead fleshy eyes is not reality, it is only illusion, it has certain range and limitations. Open your inner eyes which can leads you the ultimate perfection, feel the creator and be the creator. Finally you should realize the supreme knowledge-"immortality".