Vocabulary Review Lesson 1- The Structure of the Solar System

Many objects, including planets, travel around the Sun.

• orbit

• rotate

• revolve

• spin

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Orbiting objects made of gas, dust, and ice come from the outer parts of the solar system.

• comet

• asteroid

• planet

• moon

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

• star

• planet

• comet

• asteroid

In 365 days, Earth completes a(n) full journey around the Sun.

• period of revolution

• period of rotation

• lunar cycle

• solar cycle

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In 24 hours Earth completes a(n) full turn, also called a complete spin.

• period of rotation

• period of revolution

• orbit

• axis

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Millions of small, rocky objects orbit the Sun between the orbits of Mars and Jupiter.

• asteroid

• comet

• planet

• star

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A(n) distance equal of about 150 million km is the average distance from Earth to the Sun.

• astronomical unit

• light year

• parsec

• kilometer

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BONUS Question: What is a nebula?

• gas and dust
• gas and diesel
• walmart
• something