I recently read an article about the Big Bang Theory. The article, entitled, "Big Bang, Beginning of the Universe", discusses the big bang theory and how it was theorized. The article states how the universe is approximately 13.7 billion years old. Galaxies, including our own, have been receding away from one another.
In 1929, Edwin Hubble was an American astronomer who discovered that the galaxies all around us were receding. Hubble hypothesized that the further the galaxy was, the faster its recession was from Earth. Because of him and this theory, we have the Hubble Constant (v/d), which is an equation that is used to figure out how far galaxies were from one another.
Below is a link to the article:
http://www.astronomytoday.com/cosmology/bigbang.html
Good summary for a point.
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