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Chapter 32 Winter 2011

Chapter 32 Winter 2011 - The Solar System Chapter 32 Beyond...

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Chapter 32 Beyond Earth Did you read Chapter 32? a) Yes b) No c) No, but conference was great! The Solar System square4 Sun, planets, moons, comets, asteroids, meteoroids. Sun at the center. Eight planets ( frownface ), thousands of asteroids, and millions of comets and meteoroids orbit the sun. Dozens of moons orbit the planets. square4 Trillions of stars make up galaxies (Milky Way), 40 billion or so galaxies make up the universe. (13 billion light years). Some large… …some small Finding Distances Precisely square4 Within the Solar System use Radar Ranging. Radiation from radar travel at the speed of light Measure time from transmission to detection Distance = (speed of light) x (time delay) ÷ 2 square4 Using communication with space probes we have found distances to all planets but Pluto to within a few meters!
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Triangulation square4 Used to find distances to nearest stars. Same techniques used in land surveys square4 For astronomy, it builds upon the fact that we know the orbital radius of the earth very precisely. 90 degrees Earth Earth Sun Star 68 degrees Triangulation square4 Can be used to find distances to the nearest ~10,000 stars. square4 Other methods for greater distances discussed later…. The Moon square4 Three basic types of terrain: square4 Maria square4 Highlands square4 Craters Highlands square4 Old, original land. square4 Heavily cratered.
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