The Stars And Galaxies

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The Stars And Galaxies

MEGAN JACKSON
MS. KEYS
SCIENCE
DECEMBER 5,2000
THE STARS AND GALAXIES
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
earth’s 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 ma...

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