Universe The universe is everything that exists or has ever existed, including all matter, energy, space, and time. It can also mean the cosmos, the world, or nature. Some people think that the universe also contains ideas and abstract concepts, like math and logic . The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter. Space is also filled with radiation (e.g. light and heat), magnetic fields and high energy particles (e.g. cosmic rays) . Image Credit - Medium Where do we live in our Universe? We live in the Milky Way galaxy, which is one of billions of galaxies in the universe. The Milky Way is a barred spiral galaxy that is part of the Local Group of galaxies. The Local Group contains more than 54 galaxies, including the Andromeda Galaxy and t...