astronomy speech-structure & evolution of galaxy.docx -...

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Structure and Evolution of the GalaxyEstablish the rotation of the Milky WayChart the solar system's place in that galaxyobservations of galactic structure and dynamics showing the effects of muchmore mass in the universe than could be detected visually or by current indirectmeans.As an astronomy professor at the University of Leiden and for years director of its observatory, Dr.Oort established a reputation as one of the century's foremost explorers of the universe.One of his earliest and most important achievements was to establish the rotation of the Milky Way andto chart the solar system's place in that galaxy.Dr. Oort obtained the first direct observational evidence of the Milky Way's rotation soon after hejoined the Leiden faculty in 1926.*****************Through complex calculations, he measured the relative velocities of stars moving with the rotatinggalaxy and deduced their distances from the galactic center. In this way, he determined that the Sun and

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Term
Fall
Professor
Sam Smith
Tags
Solar System, Dr Oort

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