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An Introduction to Astronomy Our Place in the Universe Lambert E. Murray, Ph.D. Professor of Physics The Universe Contains: Stars Galaxies Clusters of Galaxies Galaxies Come in All Shapes and Sizes A Galaxy Like Our Own Approaching Our Galaxy Edge-On Stars inside the Spiral Arms Individual Stars are Often Far Apart Our Nearest Neighbor is about 4.5 Light Years Away! Our Star – The Sun The Sun’s Family of Planets (To Scale) Mercury The planet nearest to our Sun. Venus Viewed from Space is Always Covered with Clouds Venus Without Clouds Earth: Our Home Three Views of Mars from Space Mars – Close Up and Personal Jupiter Jupiter’s Galilean Moons Saturn Uranus Neptune Pluto, A Planet? Some Space Missions of Interest  Galileo to Jupiter’s Moons http://www2.jpl.nasa.gov/galileo/ (1,2,5)  Missions to Mars: Mars Orbital Surveyor http://mars.jpl.nasa.gov/mgs/msss/camera/images/index.html  Mars Rovers http://marsrovers.jpl.nasa.gov/home/   Mission to Saturn Cassini http://saturn.jpl.nasa.gov/home/index.cfm   Mission to Mercury  Messenger http://messenger.jhuapl.edu/ Additional Missions  LCROSS Mission to the Moon http://www.nasa.gov/mission_pages/LCROSS/... main/prelim_water_results.html  Mars Express http://www.esa.int/SPECIALS/Mars_Express/... index.html  Mars Reconnaissance Orbiter http://marsprogram.jpl.nasa.gov/mro/ End of Introduction