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 s Sun, planets, moons, comets, asteroids, meteoroids. Sun at the center. Eight planets ( f ), thousands of asteroids, and illions of comets and meteoroids orbit the sun. millions of comets and meteoroids orbit the sun. Dozens of moons orbit the planets. s 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 s Within the Solar System use Radar Ranging. Radiation from radar travel at the speed of light Measure time from transmission to detection istance = (speed of light) x (time delay) Distance = (speed of light) x (time delay) ÷ 2 s Using communication with space probes we have found distances to all planets but Pluto to within a few meters!
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Triangulation s Used to find distances to nearest stars. Same techniques used in land surveys s 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 s Can be used to find distances to the nearest ~10,000 stars. s Other methods for greater distances discussed later…. The Moon
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Chapter 32 Winter 2011 - The Solar System Chapter 32 Beyond...

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