Make a list of words that come to mind when you hear the word: Astronomy
SunUniverse EarthBig Bang Theory MoonAsteroids PlanetsMeteors StarsConstellations CometsSatellites NASAGravity Black HolesSupernova
History of Astronomy
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
Before We Begin… Planets Solar System Solar System Galaxy Galaxies Universe
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
Copernicus 1500s Polish astronomer Heliocentric Model – states that the Sun is the center of the universe Planets move in perfect circles around the Sun
Galileo Late 1500s - early 1600s Believed Heliocentric Model Inventor of telescope – Observed moons of Jupiter – Observed phases of Venus
Kepler Late 1500s, German mathematician Planets have elliptical orbits Unable to explain why planets orbits were elliptical
Newton 1600s-1700s Studied Gravity – developed Universal Law of Gravitation Explained why planets orbit in ellipses
Einstein Physicist, early 1900s Theory of Relativity E= mc 2 Energy = (Mass)(Speed of light) 2