According to the "Big Bang" theory, the universe began its initial expansion about 13,700 million years ago. Our universe, which first existed in a relatively small, compact state, is comprised of some three-hundred trillion stars and one-hundred trillion galaxies that are moving away from each other. Astronomer Edwin Hubble made the first description of the Big Bang theory in the 1920s.
More Famous Firsts
More Famous Firsts
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