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Solar System

Ch. 25.1: Solar System

QuestionAnswer
Geocentric Model of solar system with Earth in the center. The sun and planets orbit around Earth.
Heliocentric Model of the solar system with the sun in the center. Planets orbit around Earth.
Ptolemy Scientist credited for mapping out the movements of planets around Earth in the geocentric model of the solar system.
Epicycle The circular movement of planets as they orbit Earth in the geocentric model (Circles within circles). Used by Ptolemy to explain retrograde motion of planets.
Retrograde motion Apparent motion of a planet in a backwards motion when observed from Earth. Really caused by Earth 'by passing' the planet as we orbit sun.
Gallileo Observes moons of Jupiter and phases of Venus to prove Copernicus's helocentric model
Copernicus Puts forth heliocentric model of the solar system.
Ellipse Oval shaped (like orbits)
Gravity Force of attraction between objects. This force keeps planets from wandering off.
Inertia The force that keeps planets moving in their orbits.
Ecliptical Plane The slice of space that planets orbit the sun in.
Astronomical Unit (A.U.) A unit used to measure distances in the solar system; 1 AU is the average distance from Earth to the sun.
Inner planets Mercury, Venus, Earth, and Mars
Outer planets Jupiter, Saturn, Uranus, Neptune
Asteroids Space rocks that separate the inner and outer solar system.
Comets Rock and frozen water; The most distant objects in the solar system.
Created by: burnsie
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