The universe is vast and incomprehensibly large, and its size and age are still being explored and discovered by scientists. It is estimated to be around 13.8 billion years old, and its size is thought to be at least 93 billion light-years across. The universe also contains many mysteries, including the nature of dark matter and dark energy, the possibility of multiple universes, and the origin and fate of the universe itself.

The study of the universe and its properties is known as cosmology, and it encompasses a wide range of fields, including astronomy, physics, and mathematics. Cosmologists use a variety of tools and techniques to explore the universe, including telescopes, satellites, and computer simulations. By studying the properties and behavior of the universe, scientists hope to gain a deeper understanding of the fundamental nature of reality itself.