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Chapter 21

The Structure of the Solar System

QuestionAnswer
Millions of small, rocky objects that orbit the Sun Asteroids
Made of gas, dust, and ice and moves around the Sun in an oval-shaped orbit Comet
The average distance distance from Earth to the Sun—about 150 million km Astronomical unit (AU)
The time it takes an object to travel once around the Sun Period of revolution
The time it takes an object to complete one rotation Period of rotation
The planets closest to the Sun, are made of rock and metal, and have solid outer layers Terrestrial planets
Occurs when a planet's atmosphere traps solar energy and causes the surface temperature to increase Greenhouse effect
The four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto Galilean moons
A small, rocky particle that moves through space Meteoroid
A streak of light in Earth's atmosphere made by a glowing meteoroid Meteor
A meteoroid that strikes a planet or a moon Meteorite
A round depression formed on the surface of a planet, moon, or other space object by the impact of a meteorite Impact crater
Created by: Laila Monroe
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