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The Center of the Universe Card-Sort Directions The following slides are OUT OF ORDER. Please place them in what you think is the best order on your desk. then show it to Mr. Carter and EXPLAIN how ideas about the center of the universe have changed over time. Isaac Newton English Scientist AD 1642 –1727 Idea- Gravity Newton discovered WHY the planets orbit the sun… Gravity! Also the father of Physics, invented calculus, 3 Laws, etc. Also helped develop the scientific method. Galileo Galilei Italian Machinist/Astonomer AD 1564–1642 Idea- Telescope Improvements Galileo improved the telescope and collected data to support Copernicus’ Heliocentrism. He was tried as a heretic by the roman catholic church for these “radical” ideas. Ptolemy Greek/Roman Astronomer (lived in Egypt) Lived AD 90-168 Idea- Geocentrism: The earth is the center of the universe. The other planets, Moon, and Sun orbit the earth in circular orbits. Geo= Earth Centrism= Center Various Early 20th Century Astronomers As telescopes got better they discovered the solar system is part of the milky way. They thought the center of the milky way (most likely a black hole) was the center of the universe. Johannes Kepler German Astronomer Lived AD 1571 – 1630 Idea- Discovered that the orbits of the planets around the sun are elliptical and not circular. Early ideas about the universe Early peoples knew that the stars, planets, Sun and Moon “moved.” They were able to make calendars and predict cosmic events like comets. They often thought the stars and planets were demons, gods, demigods, etc. Various Mid 20th Century Astronomers As technology got better we discovered there are more galaxies than our own (more than we can currently count). Ours is near the center, but some are closer. Nothing is at the center of the universe, because all matter and energy left that point because of the Big Bang. Nicolaus Copernicus Polish Astronomer Lived AD 1473 –1543 Idea- Heliocentrism Helio- Sun Centrism – Center The sun is the center of the universe. The planets orbit the sun in circular orbits.