ࡱ> a 'bjbj[[  9bE\9bE\F  ppptx9<<<<<<67< 8 ;;;;;;;$=@;p82Z688;<<g;|;|;|;8V<p<;|;8;|;|;|;<zn 9|;; <09<|;3A:@3A|;3Ap|;()80Y8"|;{88_)8)8)8;;6;F)8)8)89<88883A)8)8)8)8)8)8)8)8)8 > Z: Name Date Class   LESSON 1 The Structure of the Solar System Directions: On each line, write the term from the word bank that correctly replaces the underlined words in each sentence. Use each term only once. NOTE: You may need to change a term to its plural form. asteroid astronomical unit comet orbit period of revolution period of rotation star 1. Many objects, including planets, travel around the Sun. 2. Orbiting objects made of gas, dust, and ice come from the outer parts of the solar system. 3. The Sun is a(n) structure in space made of gases in which nuclear fusion reactions occur. 4. In 365 days, Earth completes a(n) full journey around the Sun. 5. In 24 hours Earth completes a(n) full turn, also called a complete spin. 6. Millions of small, rocky objects orbit the Sun between the orbits of Mars and Jupiter. 7. A(n) distance equal of about 150 million km is the average distance from Earth to the Sun. The Solar System 9 Name Date Class   LESSON 1 The Structure of the Solar System Earth inner planets Jupiter Mars Mercury Neptune outer planets Saturn Sun Uranus Venus Directions: Label this diagram by writing the correct term from the word bank on each line.  The Solar System 13 Name Date Class  LESSON 1 The Structure of the Solar System Directions: On each line, write the term from the word bank that correctly completes each sentence. Some terms may be used more than once or not at all. astronomical closer comet elliptical energy farther faster foci focus gas giants gravitational inner outer planet revolve rotate slower solar system stars Sun The night sky offers a fascinating view into space. Most of the specks of light in the night sky are (1.) . They exist far beyond our (2.) . The largest object in our solar system is the (3.) , which produces an enormous amount of (4.) . The Sun also applies a(n) (5.) pull on the planets. When you look into the night sky, you might see light reflected off a(n) (6.) , such as Venus. Objects in space (7.) around the Sun along a stretched-out circle called a(n) (8.) orbit. Planets also (9.) , or spin. There are four (10.) planets that are made up mostly of solid rocky materials. These objects are spherical and have a mass larger than the total mass of all other objects whose orbits are nearby. There also are four (11.) planets made of gases, including helium and hydrogen. These four planets are sometimes termed (12.) . Distance in space is measured in (13.) units. A planets speed changes as it orbits the Sun. A planet that is close to the Sun moves (14.) than a planet that is far from the Sun. Also, planets that are (15.) from the Sun have longer periods of revolution than planets that are closer to the Sun. The shape of a planets orbit is determined by two (16.) points. These (17.) are equal distances from the center of the ellipse. 14 The Solar System Name Date Class  LESSON 1 The Structure of the Solar System Key Concept How are the inner planets different from the outer planets? Directions: On the line before each description, write the letter of the term that matches it correctly. Some terms will be used more than once. 1. four planets closest to the Sun 2. nonspherical rocky objects 3. the largest object in the solar system 4. Jupiter, Saturn, Uranus, and Neptune 5. one trillion of them might orbit the Sun 6. a source of light energy 7. planets made of mostly solid rocky materials 8. Ceres, Pluto, Eris, and Makemake 9. planets made mainly of ice and gases 10. Mercury, Venus, Earth, and Mars 11. sometimes called gas giants 12. where nuclear fusion reactions occur 13. planets much larger than Earth A. Sun B. inner planets C. asteroids D. outer planets E. dwarf planets F. comets 16 The Solar System Name Date Class  LESSON 1 The Structure of the Solar System Key Concept What is an astronomical unit, and why is it used? The Astronomical Unit (AU)PlanetAverage Distance (km)Average Distance (AU)Mercury57,910,0000.39Venus108,210,0000.72Earth149,600,0001.00Mars227,920,0001.52Jupiter778,570,0005.20Saturn1,433,530,0009.58Uranus2,872,460,00019.20Neptune4,495,060,00030.05Directions: Use the table to complete each statement. 1. Astronomical units are used for measuring in space because . 2. The closest inner planet to the Sun is . In astronomical units, this planet is from the Sun. 3. The closest outer planet to the Sun is . In astronomical units, this planet is from the Sun. 4. In astronomical units, Earth is from the Sun. 5. An astronomical unit is given as the average distance from the Sun because orbits are not perfect circles; they are . 6. Neptune is about times farther from the Sun than Jupiter, and Jupiter is about times farther from the Sun than Earth. 18 The Solar System Name Date Class  LESSON 1 The Structure of the Solar System Key Concept What is the shape of a planets orbit? Directions: Circle the phrase that correctly completes the sentence.  1. Planets revolve around the Sun  2. An ellipse is like a  3. A planet moves slower  4. A planets speed increases  5. Planets that are farther from the Sun  6. The shape of a planets orbit The Solar System 19 Content Vocabulary Content Practice A Content Practice B Key Concept Builder Key Concept Builder Key Concept Builder A. in ellipses. B. in perfect circles. A. figure eight. B. stretched-out circle. A. when it is farther from the Sun. B. when it is closer to the Sun. A. as it gets closer to the Sun. B. as it gets closer to either focus. A. have longer periods of rotation. B. have longer periods of revolution. A. depends on its speed. 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