Astronomy Lecture 2 - 3 Jupiter: The Largest Planet &...

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1 Lecture 2 An Overview of Astronomy Contents: 1. An overview of the subject matter of astronomy. 2. The distances in the universe. 3. Definitions of quantities such as AU and light year. 4. A few important numerical values for distances, masses, and speeds. Concurrent Textbook Reading: None. Tomb of Pharaoh Seti I (ruled The Earth from Space
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2 The Earth Spherical Radius = 6400 km Mass = 6 x 10 27 gm 71% covered by water Atmosphere is 23% oxygen. The Size of the Moon Compared to the Size of the United States Moon&s radius = 1700 km Earth Radius = 6400 km Moon Radius = 1700 km Earth-Moon Distance = 3.8 10 5 km Moon orbits the Earth in 27 days The Earth-Moon System Earth Moon 1 1/4 60 Surface Features of the Moon ± Impact craters ± Mountain ranges ± Plains of solidified lava The Sun ± A large ball of hot, glowing gas ± Temperature is 5800 degrees The Appearance of the Sun in X-Rays Radius = 7 x 10 5 km = 100 Earths Mass = 2 x 10 33 gm = 1 million Earths
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Unformatted text preview: 3 Jupiter: The Largest Planet & Mass is 320 times greater than the Earths & Radius is 11 times greater than the Earths & Liquid/gas no solid surface The Constellation Leo, The Lion About 6000 stars are visible to the unaided eye. Stars Often Come in Clusters The globular cluster M3 The Milky Way Stars And a heaven full of stars Over my head, White and topaz And misty red; Myriads with beating Hearts of fire That aeons Cannot vex or tire; Up the dome of heaven Like a great hill, I watch them marching Stately and still, And I know that I Am honored to be Witness Of so much majesty. by Sara Teasdale 4 Magnified View of the Milky Way The Spiral Galaxy M51, the &Whirlpool Galaxy The Nearby Galaxy M31 in Andromeda The Sizes and Separation of Galaxies 50,000 Ly 1,000,000 Ly Colliding Galaxies The Cluster of Galaxies Abell 1689 5 The Quasar 3C 273 and Its Jet & A Supermassive Black Hole...
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This note was uploaded on 04/06/2009 for the course AST 301 taught by Professor Harvey during the Spring '07 term at University of Texas at Austin.

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Astronomy Lecture 2 - 3 Jupiter: The Largest Planet &...

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