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Nativity- Solar

Chapter 14 - The Solar System

geocentric an model of the universe in which Earth is at the center of the revolving planets and stars
heliocentric a model of the universe in which Earth and the other planets revolve around the sun
ellipse an oval shape which may be elongated or nearly circular
moon a natural satellite that revolves around a planet
astronomical unit a unit of measure used to express distance in space; 1 = Earth's average distance from the sun (150 million kilometers)
How did Copernicus contribute to our knowledge of the solar system? Copernicus worked out the arrangement of the known planets and how they move around the sun; polish astronomer who, in 1543, further developed the heliocentric model
How did Galileo contribute to our knowledge of the solar system? Galileo used the newly invented telescope to make discoveries that supported the heliocentric model; for example he discovered four moons revolving around Jupiter and that Venus goes through a series of phases similar to thoses of Earth's moon
How did Kepler contribute to our knowledge of the solar system? Johannes Kepler, the assistant of Danish astronomer Tycho Brahe, used his boss's data to develop three laws that describe the motions of the planets
What objects make up the solar system? today we know that the solar system consists of the sun the planets and their moons, and several kinds of smaller objects that revolve around the sun
How did Ptolemy contribute to our knowledge of the solar system? early Greek astronomer who thought that the Earth was the center of a system of planets and stars, and explained that the planets move on small circles that move on bigger circles
What were Kepler's Laws? 1.the orbit of each planet is an ellipse; 2.each planet moves faster when it is closer to the sun and slower when it is farther away from the sun; 3.planets closer to the sun orbit the sun faster than the planets that are farther away from the sun
Created by: stmvocab