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Unformatted text preview: earth's radius A few more useful numbers distance to nearest star = 4x10 18 cm size of a galaxy = 3x10 22 cm distance to nearest galaxy = 2x10 23 cm So how much bigger is the distance to the nearest galaxy as the size of our galaxy 2x10 23 / 3x10 22 = 2/3 x10 1 = 6.6 Scale model of solar system Earth is 1/10 of a cm in size The solar system is the size of campus Where is the nearest star? about the distance to Los Angeles Discuss Video Lots of distances in that video In this course you will learn how people actually measure those giant distances Today we'll start with a well known method to astronomers called parallax Parallax = a method for finding the distances to fairly nearby objects like planets and some stars. Far away objects move less. Astronomers use the same effect with 2 telescopes to determine distances...
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