How can it be understood that the universe is 93 billion light years across and yet only 13.8 billion years old? [N.B. If youre going to suggest e The steep drop-off favors the merger of two white dwarfs because it predicts that most stars in the early universe are too young to become Type Ia supernovae. 93 billion light-years is only the diameter of the universe that we can see -- the visible universe -- reaches of the universe beyond this are concealed by the cosmic microwave background radiation, a field that is created by the hot plasma that was omnipresent in the first 300,000 years after the Big Bang. Not the observable universe, which is currently a sphere about 93 billion light years across and increasing all the time, but the much smaller portion that we could ever hope to reach. The visible universe is thus a sphere with a diameter of about 28 billion parsecs (about 93 billion light-years). A galaxy is just about the largest object in the universe. The observable universe is fixed at 13.7 billion light years in all directions from earth. How can that be when the universe is only 13.7 billion years old? If the universe is curved, though, it must be so colossal that the entire 93 billion light-years we can see isnt a large enough portion to reveal the curvature. One of the interesting things about the universe is that it is currently expanding. The Universe is getting smaller. It is unclear on how big it is, but a common answer that the universe is NOT infinite and is about 600 Billion Light years Across. A. Reset. As an illustraction, take the infinite 'universe' of the natural numbers i = 0 . The whole universe is at least 250 times as large as the observable universe. Also, how big is the universe compared to the Earth? So space is really big, but its not infinite. Here is how you can do it more effectively for the best results: Sleep. The age of the universe is about 13.75 billion years. Since the Universe is expanding, our cosmic playground is shrinking all the time. Only 4% of the universe is what we can actually see, stars, galaxies, planets, nebulae, etc.