3. The Sun is a(n) structure in space made of gases in which nuclear fusion reactions occur.

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Content Vocabulary
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 th
orbits of Mars and Jupiter.
7. A(n) distance equal of about 150 million km is the aver
distance from Earth to the Sun.
he Solar System
Transcribed Image Text:Content Vocabulary 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 th orbits of Mars and Jupiter. 7. A(n) distance equal of about 150 million km is the aver distance from Earth to the Sun. he Solar System
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