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Nicolaus Copernicus Polish developed a simple heliocentric model of the solar system that explained planetary retrograde motion and overturned Greek astronomy. Galileo Galilei Italian performed fundamental observations, experiments, and mathematical analyses in astronomy and physics; discovered mountains and craters term paper astronomy the moon, term paper astronomy phases of Venus, and the four largest satellites of Jupiter: Io, Europa, Callisto, and Ganymede. Johannes Kepler German established the most exact astronomical tables then known; established the three laws of planetary motion.
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Henry Norris Thesis on vlsi design American used photographic methods to measure stellar parallaxes, leading to the discovery of the relationship between absolute magnitude and spectral types of stars; term paper astronomy plot of this relationship is now term paper astronomy a Hertzsprung-Russell diagram or H-R diagram. Bernhard Schmidt Swedish-born German invented and constructed the term paper astronomy Schmidt reflecting telescope using a corrector plate he devised to eliminate aberration of the image.
Arthur Anarchism and other essays online. Eddington British first to confirm Einstein's prediction that light will bend near a star; discovered the mass-luminosity relation for stars; theoretically explained the pulsation of Cepheid variables. Harlow Shapley American discovered the size of our justice delayed is justice denied essay and the direction of its center by studying the distribution of globular clusters; determined the orbits of many eclipsing binary term paper astronomy. Edwin Hubble American first to measure distance to the Andromeda nebula, establishing it to be a separate galaxy; later measured distances to other galaxies and discovered that they recede at a rate proportional to their distance Hubble's law.
Rudolph Minkowski German divided supernovae into Types I and II; optically identified many of the early radio sources. Bernard-Ferdinand Lyot French invented the coronagraph. Otto Struve Russian-born American term paper astronomy detailed spectroscopic studies of remembering an event essay help binary stars; discovered interstellar matter H II regions. Jan Hendrik Oort Dutch calculated distance to center of galaxy; determined period for sun to complete one revolution of Milky Way; calculated the mass of the Milky Term paper astronomy proposed existence of huge spherical cloud of icy comets the Oort cloud left behind from formation of the solar system.
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Gerard P. Bruno B. Rossi Italian pioneer of x-ray astronomy and space plasma physics; participated in discovery of the first known x-ray source outside the solar system Scorpius X Bart Jan Bok Dutch suggested that small dark globules of interstellar gas and dusk now called Bok globules are collapsing to form new stars. Clyde Tombaugh American discovered the planet Pluto. Viktor Ambartsumian Soviet one of the founders of theoretical astrophysics; first to suggest that T Tauri stars are very young and that nearby stellar associations are expanding. Grote Reber American built the first radio telescope a parabolic reflector 31 feet in diameterthereby becoming the first radio astronomer. Carl K. Seyfert Term paper astronomy discovered the first active galaxy, part of term paper astronomy group now called Seyfert galaxies.
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Best email marketing case studies Term paper astronomy. Salpeter Austrian-born American explained how the triple-alpha reaction could make carbon from helium in stars; worked on atomic theory and quantum electrodynamics; co-developed the Bethe-Salpeter equation; contributed to nuclear astrophysics, stellar evolution, statistical mechanics, and plasma physics.
Allan R. Benefits of part time job essay American identified the first quasar, and discovered many more; determined ages history essay contests for high school students many globular clusters. Irwin I.
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John N. Bahcall American made important theoretical contributions to understanding solar neutrinos and quasars. James W. Christy American discovered Pluto's satellite, Charon. Term paper astronomy K. Hartmann American well-known painter of astronomical themes; co-developed the most widely accepted theory of the formation of the Moon from the collision of a giant planetismal with the Earth at term paper astronomy close of the planet-forming period of the solar system.