Aug 28 - Universe Astronomy 307 - 1st meeting Aug. 28, 2008...

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Universe Astronomy 307 - 1st meeting Aug. 28, 2008 Introducing: The Universe Setting the Scene: cast of characters Framing the picture: “powers of ten”
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The Cast of Characters
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Universe The sum total of everything: all matter and energy in and between galaxies
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A large, hot ball of gas that produces its own light by means of nuclear fusion Stars (for example, the Sun) Fig. 1-5 Fig. 1-1
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Planet A moderately large object that orbits a star and shines by reflected light. A planet may be rocky, icy, or gaseous.
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Moon (or Satellite) An object that orbits a planet. (Does it have to orbit the Earth?) Ganymede (a moon of Jupiter)
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Asteroid A small, rocky object that orbits a star. Comet A small, icy object that orbits a star.
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Solar (or Planetary) System A star and all the material which orbits it, including its planets and moons Fig. 1-2
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Interstellar Nebulae Clouds of gas and dust located in space, between the stars (“interstellar clouds”) The dark lanes are due to “dust,” which absorbs the visible light but is bright in infrared radiation
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Nebulae Created by Stars Supernova remnant: the debris from a gigantic stellar explosion Fig. 1-8
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Galaxy A large system of stars and gas, held together by gravity (an “island universe”)
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Figure on p. 16
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Aug 28 - Universe Astronomy 307 - 1st meeting Aug. 28, 2008...

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