Famous astronomers: How these scientists shaped astronomy
Before Cannon, stars were classified alphabetically, from A to Q, based on their temperatures. Cannon realized that a star's elements create different wavelength and determine its color. In 1901, she had improved the classification system with ten categories that also reflected a star's color and brightness.
Cannon inspired many women to work in astronomy, at a time when gender biases greatly favored men in the space industry. became one of the most famous scientists ever after proposing a new way of looking at the universe that went beyond current understanding.
Prior to his observations, the discussion over the size of the universe was divided as to whether or not only a single galaxy existed. Hubble went on to determine that the universe itself was expanding, a calculation which later came to be known as Hubble's law. Hubble's observations of the various galaxies allowed him to create a standard system of classification still used today. calculated the size of the Milky Way galaxy and general location of its center.
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