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Chapter 11.1

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Information about Chapter 11.1

Published on March 18, 2014

Author: reginakorrnell

Source: slideshare.net

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Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 1 Vocabulary * Asteroid (377) – millions of small, rocky objects that orbit the Sun in the asteroid belt between the orbits of Mars and Jupiter. * Comet (377) – an object made of gas, dust, and ice and moves around the Sun in an oval- shaped orbit * Astronomical Unit (AU) (378) – the average distance from Earth to the Sun – about 150 million km * Period of Revolution (378) – the time it takes and object to travel once around the Sun * Period of Rotation (378) – the time it takes an object to complete one rotation

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 2 What is the solar system? * When looking at the night sky, you will likely see stars and planets. Sometimes, the first star-like object you see at night is not a star at all. * A few of the tiny lights that you can see are part of our _______________________. * Almost all of the other specks of light are______________. Objects in the Solar System * Ancient observes looking at the night sky saw many stars but only five______________________– Mercury, Venus, Mars, Jupiter, and Saturn. * The invention of the _____________________in the 1600s led to the discovery of additional planets and many other space objects. The Sun * The ____________________object in the solar system is the Sun, a star. * Its diameter is about ________________________ km. * Its made mostly of ___________________ gas * Its mass makes up about _______________ percent of the entire ___________ of the solar system * Inside the Sun, a process called nuclear ____________________produces an enormous amount of energy. * Some of the energy is emitted as ___________________ * The Sun also applies ____________________________ forces to objects in the solar system.

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 3 * Gravitational forces cause the planets and other objects to move around, or_______________, the Sun. Objects That Orbit the Sun * Planets, dwarf planets, _____________________, and comets orbit the Sun. * These ______________ emit light. *Planets * An object is a planet only if it orbits the Sun and has a nearly _______________________ shape. * The mass of a planet must be much _________________ than the total mass of all other objects whose orbits are close by. * Our solar system has _______________________ objects classified as planets. * Inner Planets and Outer Planets * The four planets closet to the Sun are the ____________________ planets. * _______________________________________________________________________ * These planets are mainly made of ________________________ rocky materials * The four planets farthest from the Sun are called the _____________________ planets * ______________________________________________________________________ * These planets are mainly made of ice and gases such as ________________and___________________. * Because they are much larger than Earth, we also call them ___________________. * Dwarf Planets

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 4 * A ________________ planet is a spherical object that orbits the Sun. * It is not a ___________________ of another planet and is in a region of the solar system where there are many objects orbiting ________________ it. * Unlike a planet, a dwarf planet does not have more __________________ than objects in nearby orbits * They are made of rock and ice and are much ____________________ than Earth. * They include Ceres, Eris, Pluto, and__________________________. * Asteroids * Millions of small, rocky objects called asteroids orbit the Sun in the asteroid belt between the orbits of _______________ and Jupiter * They range in size from less than a __________________ to several hundred kilometers in length * Unlike planets and dwarf planets, asteroids usually aren’t __________________________ * Comets * A comet is made of________________, dust, and ice and moves around the Sun in an ________________-shaped orbit. * Comets come from the ________________ parts of the solar system. * There might be __________________comets orbiting the Sun. The Astronomical Unit

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 5 * On Earth we use meters or_____________. * Objects in the solar system, are so far apart that astronomers use a larger distance unit. * An __________________________________________________(AU) is the average distance from Earth to the Sun – about 150 million km. The Motion of the Planets * Revolution and Rotation * The time it takes an object to travel once around the Sun is its period of ___________________ * Earth’s period of revolution is one__________. * The time it takes an object to complete one rotation is its period of _____________________ * Earth’s period of rotation is one _________

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 6 * Planetary Orbits and Speeds * Unlike a ball swinging on the end of a string, planets do not move in ________________ * Instead, a planet’s orbit is an__________________ – a stretched-out circle * Inside an ellipse are two special points, each called a_____________________. * These focus points, or foci, determine the __________________ of the ellipse. * The foci are ___________________ distances from the center of the ellipse. * A planet’s ________________also changes as it orbits the Sun. The ___________________the planet is to the Sun, the ________________________it moves. * This also means that planets farther from the Sun have longer periods of_______________________. * For example, Jupiter is more than 5 times farther from the Sun than_______________. * It takes Jupiter _______________ times longer than Earth to revolve around the Sun.

Chapter 11 Lesson 1: The Structures of the Solar System – p. 374-380 – page 6 * Planetary Orbits and Speeds * Unlike a ball swinging on the end of a string, planets do not move in ________________ * Instead, a planet’s orbit is an__________________ – a stretched-out circle * Inside an ellipse are two special points, each called a_____________________. * These focus points, or foci, determine the __________________ of the ellipse. * The foci are ___________________ distances from the center of the ellipse. * A planet’s ________________also changes as it orbits the Sun. The ___________________the planet is to the Sun, the ________________________it moves. * This also means that planets farther from the Sun have longer periods of_______________________. * For example, Jupiter is more than 5 times farther from the Sun than_______________. * It takes Jupiter _______________ times longer than Earth to revolve around the Sun.

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