Why is the universe so big? Astronomy Scale and History of the Universe Scale of Earth, Sun, Galaxy, and Universe 1 Answer Suryin =) Nov 20, 2015 Because it is still EXPANDING. Answer link Related questions Is the word "universe" supposed to be capitalized as a proper noun? Where does the universe end? What is the universe? How can scientists estimate the age of the universe? How does this estimate take into account... What are all the theories that explain the creation of the universe? Is the universe sentient? Will the universe end? If the universe is always expanding, what is causing it to do so? Does the universe have a shape? Was the universe formed by the big bang? See all questions in Scale of Earth, Sun, Galaxy, and Universe Impact of this question 1743 views around the world You can reuse this answer Creative Commons License