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Geocentric Model of the Solar System
Geocentric Model of the Solar System

... In 200 A.D., the Greek astronomer Ptolemy explained this “retrograde’ motion by stating that the planets orbited the Earth in a circle, but also orbited another point in a circle, what he called an epicycle. ...
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... Chapter 27 Section 2: Models of the Solar System 11. Copernicus proposed a heliocentric model of the universe, in which the planets revolve at different speeds around the sun. 12. Kepler’s first law states that planets orbit the sun in paths called ellipses. Chapter 27 Section 3: The Inner Planets 1 ...
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... • Greeks believed in geocentric model of the universe. • “Geo” means Earth • Geocentric model- the Earth was a sphere that stayed motionless. The moon, sun, and known planets- Mercury, Venus, Mars, Jupiter- orbit the Earth. ...
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... a. The geocentric theory is correct. b. The geocentric theory is flawed and was immediately rejected. c. The geocentric theory is flawed but was accepted for thousands of years. d. The geocentric theory is accepted today. ...
"The Solar System" Slideshow
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The Solar System
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... geologically active object in the Solar System. Europa (3121.6 km) The smooth surface includes a layer of ice, while the bottom of the ice is theorized to be liquid water. Ganymede (5262 km) largest natural satellite in the Solar System, a salt-water ocean is believed to exist nearly 200km below Gan ...
Earth Science Chapter Two: What Makes Up the Solar System
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... 6. How did the inner planets get their name? 7. Why would astronauts not be able to leave their spacecrafts on Mercury, even with spacesuits? 8. What makes Venus extremely poisonous to humans? 9. What are the two basic features that make life possible on Earth? 10. What do Mars and Earth both have i ...
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Week 3 - Emerson Valley School
Week 3 - Emerson Valley School

... star we call the sun. For thousands of years, astronomers have studied the movements of the planets across our solar system. These spherical bodies march across the sky in a predictable way: the length of their days and years remaining reliably constant. Although scientists have learned a great deal ...
Document
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... 1. This object started the competition between Russia and the U.S. What is the name of this object? Answers ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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