f10_aug26 - Universe Astronomy 307 1st meeting Aug 26 2010...

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Ast 307 Universe Astronomy 307 - 1st meeting Aug. 26, 2010 Introducing the Universe Course Structure and Syllabus Setting the Scene: the cast of characters Measurement: scientific notation & units 8/26/10 Ast 307 2 The Cast of Characters Ast 307 Universe The total of everything: all matter and energy in and between galaxies 8/26/10 Ast 307 4 Star A large, hot ball of gas that produces its own light (usually) by means of thermonuclear fusion reactions
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8/26/10 Ast 307 5 Planet A moderately large object that orbits a star and shines by reflected light. A planet may be rocky, icy, or gaseous. 8/26/10 Ast 307 6 Moon Ganymede (a moon of Jupiter) An object that orbits a planet…not necessarily Earth! 8/26/10 Ast 307 7 Asteroid Comet A small, rocky object that orbits a star. The nucleus is a small, icy body orbiting a star. The tail is a thin (low density) stream of gas and dust. 8/26/10 Ast 307 8 “Solar” or Planetary System A star and all the material which orbits it, including its planets and moons
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8/26/10 Ast 307 9 Interstellar Nebula Clouds of low-density material in space,
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