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Published byIsaiah Callahan Modified over 10 years ago
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Make a list of words that come to mind when you hear the word: Astronomy
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SunUniverse EarthBig Bang Theory MoonAsteroids PlanetsMeteors StarsConstellations CometsSatellites NASAGravity Black HolesSupernova
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History of Astronomy
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Essential Question How do astronomers learn what is beyond our atmosphere? Todays Objectives: – Explain geocentric and heliocentric models of solar system – Describe history of Astronomy
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Before We Begin… Planets Solar System Solar System Galaxy Galaxies Universe
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Early Greek Astronomers Ptolemy Geocentric Model – states that the Earth is the center of everything in universe Planets move in perfect circles around the Earth
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Copernicus 1500s Polish astronomer Heliocentric Model – states that the Sun is the center of the universe Planets move in perfect circles around the Sun
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Galileo Late 1500s - early 1600s Believed Heliocentric Model Inventor of telescope – Observed moons of Jupiter – Observed phases of Venus
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Kepler Late 1500s, German mathematician Planets have elliptical orbits Unable to explain why planets orbits were elliptical
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Newton 1600s-1700s Studied Gravity – developed Universal Law of Gravitation Explained why planets orbit in ellipses
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Einstein Physicist, early 1900s Theory of Relativity E= mc 2 Energy = (Mass)(Speed of light) 2
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