No person in history has had greater impact in determining the extent of our universe than Edwin Hubble . From proving that other galaxies existed to proving that galaxies move apart from one another , Hubble 's work defined our place in the cosmos. Hubble lived from 1889 to 1953 and is shown above posing with the 48-inch telescope on Palomar Mountain and his famous pipe. In memory of his great work, the Orbiting Space Telescope was named after him . Today a great controversy rages on the rate of the universe's expansion, parameterized by a quantity known as Hubble's constant . A real live debate on this subject will take place in Washington, DC this April.
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Credit: Mt. Wilson Archive, Carnegie Institution of Washington