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Unformatted text preview: telescopes in space dont want the color and atmospheric distortion Inverse Square Law o Amount per unit area of something (light, gravity?) equally distributed over inner sphere will be weaker (by 1/r^2) when its distributed over outer sphere o Area of a sphere: 4pie r^2 Take an amount (4pie) of something (paint, light) and distribute it over the surface of a small sphere then how much we figure out how much would be distributed over a large sphere? R=1 area= 4pie amount per square inch=1 R=2 area=16pie amount per sq inch=1/4 o Inverse square law: a geometrical law Know how bright something is, can determine how far away that object it Measure star, explosion out in space, measure how bright it appears, makes educated guess about how bright object really is, find distance from earth to the object...
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- Spring '11