Hubble_Edwin3

**__THE HOOKER TELESCOPE__**

**Edwin Hubble's arrival at Mount Wilson, California in 1919 coincided roughly with the completion of the Hooker Telescope, the world's largest telescope at the time. At this point in time, common knowledge was that the entirety of the universe was comprised of the Milky Way galaxy. Using the Hooker Telescope at Mt. Wilson, Hubble identified Cephied Variables (a kind of star) in several spiral nebulae, including the Andromeda nebulae. A nebulea is an interstellar cloud of dust that originates from a central point (a collapsed star). His observations that he made in 1922-1923 proved that the nebulae were much too distant to be part of our galaxy, and thus, they must be a different galaxy, or possibly many.

He also discovered the most commonly used method of classifying galaxies. It is done by grouping them according to their photographic images. This method became known as the "Hubble Sequence".

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