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## ASTRONOMY

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**ASTRONOMY**FAMOUS ASTRONOMERS**PTOLEMY-85-165AD**• Believed in geocentric universe • earth was the center • used circular orbits with epicycles • was supported by the church for 1500 years**Copernicus-1473-1543AD**• Believed in heliocentric universe • sun was the center • still used the circular orbits**Tycho Brahe 1546-1601AD**• Supreme mathematician who studied the orbits of the planets • had a gold nose • made the best observation of Mars**Kepler 1571-1630**• Studied with Brahe • wrote the Laws of Planetary Motion • gave the planets an elliptical orbit**Kepler’s Laws of Planetary Motion**A3/ P² = c • 1. Every planets orbit is an ellipse. • 2. An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. • 3. The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)**Galileo 1564-1642**• Perfected and used atelescope • 1. Discovered Saturn’s rings**2. 4 moons of Jupiter**3. Craters on the moon 4. Sunspots on the sun**Newton1642-1727**Wrote the Laws of Motion • #1 INERTIA • a body at rest /motion • will remain at rest/motion • unless acted upon by an outside force**#2 the amount of force an object has is equal to the mass x**the acceleration**# 3 For every action**• there is an equal and opposite reaction**Einstein-1879-1955**• Wrote the Theory of Relativity • gravity holds the universe together • Constant motion**Space and light are related**• E=mc2 energy= mass x the speed of light squared**Caption: Einstein's theory of general relativity may be**interpreted in terms of a curvature of space in the presence of a gravitational field.**Speed of light=**• 186,000 mi/ sec • or 300,000 Km /sec