In fact, we know jack squat about the universe, except what we’ve been told by a bunch of clowns from NASA.
Sadaputa Das (Dr. Richard Thompson Ph.D) once made the point that if all the stars we see in the sky were suns, as we are told by NASA, we’d have constant daylight by now.
The modern way of thinking has fostered the idea that the universe is infinite, but the universe is not infinite.
In the Vedic version the universe is described as finite. When God in His form as Maha-vishnnu exhales, billions of universes emanate from His skin-pores, and when He inhales, all these universes are again subtracted into His body.
The duration of our universe is 311 trillion solar years. That means, one breath of God lasts 311 trillion years. The expansion of God generating matter is called Maha-vishnu - the great Vishnu. We can hardly imagine how big you must be, if your one breath lasts 311 trillion years and universes are generated from your skin-pores.
Our particular universe is four billion miles in diameter. Those 4 billion miles of space are encased in 8 material layers consisting of earth, water, fire, air, ether, mind, intelligence, and false ego. These 8 elements are the material elements from which the world is composed.
The first layer of covering is the same as the diameter of the universe - 4 billion miles. The next layer is 10 times that, the following layer is 10 times that, and so on.
The material layers covering the universal space are so thick, that the universal space is something like a pea in the middle of a football field. This is not an exact analogy, it is just to give an idea of how thick are the layers covering the universe.
Outside of the material universes is the infinite spiritual sky.
Lord Brahma (god of creation) says:
"Let me offer my respectful obeisances unto the Original Personality of Godhead Govinda whose plenary portion is the Mahavishnu. All the Brahmas or the heads of the universes live only for the period of his exhaling after the universes are generated from the hair holes of His transcendental body." —Brahma samhita 5.48