Origin and evolution of the universe
of the deepest questions in cosmology, the science that deals with the study and origin of the universe and everything in it, relates to how the universe came into existence. Cosmologists estimate that the universe is 10-20 billion years old and consists of a huge number of stars grouped in galaxies, clusters of galaxies, and superclusters of galaxies, surrounded by vast distances of open space. The universe is thought to be expanding because measurements show that the most distant galaxies, quasars, and other objects in the universe are moving away from each other and from the center of the universe.
Continue reading here: The Big Bang
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