The universe with space and time and all that matters. The Earth and all the other planets , the Sun and other stars and constellations , the luminous space and their interstellar matter , the lambda-cdm design , the energy and space , which are still theoretically experienced but not directly observed. It is called the universe. The diameter of our observable universe is about 26 billion Parsec ( 91 billion light years). Although the size of the whole world is unknown, there are several hypotheses about its composition and origin . Cosmology is about the origin of the universe. Observations of the farthest reaches of the visible universe and various theoretical studies suggest that every process in the universe is determined by the same kind of natural laws and certain constants from its creation. According to the Big Bang theory , its size is increasing. Recently, various theories of modern physicists are talking about the possibility of having many more universes besides our visible universe, that is, the eternal universe.