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Word Count: 398
Have you ever looked up at the sky and wondered what are those bright and shiny things up there Stars a natural luminious body visible in the sky especially at night A self-luminious gaseous celestial body ofgreat mass which produces energy by means of nuclear fusion reactions whose shape is usually spheroidal and whose size may be as small as the earth or larger than the earths orbit Galaxies Any of the very large groups of stars and associated matter that are found throughout the universe In 1802 William Wollaston noted that the spectrum of sunlight did not appear to be a continious band of colors but rather had a series of dark lines superimposed on it Wollaston attributed the lines to natural boundaries between colors Joseph Fraunhofer made a more careful set of observations of the solar spectrum in 1814 and found some 600 dark lines and he specifically measured the wavelenght of 324 of them Many of the Fraunhofer lines in the solar spectrum retain the notations he created to designate them In 1864 Sir William Huggins matched some of these dark lines in the spectra from other stars with terrestrial substances demonstrating that the stars are made of the same materials of everyday material rather than exotic substances This paved the way for modern spectroscopy Since even before the discovery of the spectra scientists had tried to find ways to catergorize stars By observing spectra astronomers realized that the large numbers of stars exhibit a small number of distinct patterns in their spectral lines Classification by the spectral features quickly proved to be a powerful tool for understanding stars The current spectral classification scheme was developed at Harvard Observatory in the early 20th century Work was begun by Henry Draper who photographed the first spectrum of Vega in 1872 After his death his wife donated the equipment and a sum of money to the Observatory to continue his work The bulk
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