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Unformatted text preview: 8 cm Distance to Sun = 1.5 x 10 13 cm = 23500 Earth radii = 1 Astronomical Unit (AU) Distance to next nearest star (Proxima Centauri): 270,000 AU = 4.3 "light years" (light year: distance light travels in one year, 9.5 x 10 12 km. Speed of light: c = 3 x 10 8 m/sec) Size of Milky Way Galaxy: about 100,000 light years Distance to next large galaxy (Andromeda): 2 x 10 6 light years 2. Huge masses: Mass of Earth = 6 x 10 24 kg = 6 x 10 27 g = 1 M Earth (or 6000 billion billion tons) Mass of Sun = 2 x 10 30 kg = 2 x 10 33 g = 1 M Sun = 1 "Solar Mass" = 333,000 M Earth Mass of Milky Way galaxy: 6 x 10 11 M Sun 3. Long ages and times: Age of Earth and Solar System: 4.5 billion years = 4.5 x 10 9 years Lifetime of stars: about 10 6 10 12 years Age of universe: about 10 10 years 4. Very high and low temperatures: An interstellar "molecular cloud": T = 10 K Center of Sun: T = 1.5 x 10 7 K...
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 Fall '09
 Astronomy, Mass, Astronomical unit, OC

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