Unit 4 Earth, Moon, and the Stars Review

1. In which direction

does Earth’s gravity pull?

• A. toward

  the sun

• B. toward

  Earth’s center

• C. toward

  the North Pole

• D. toward

  the tallest mountain

2. The force of

gravity between two objects increases as they are

• A. spread apart.

• B. moved

  closer together.

• C. cooled.

• D. heated.

3. The sun’s gravity is Earth’s because the sun is than Earth.

• A. stronger than, smaller

• B. weaker than, bigger

• C. stronger than, bigger

• D. weaker than, smaller

4. The moon’s gravity

is weaker than Earth’s. If you went to the moon, you would

• A. shrink and become shorter.

• B. weigh less than you do on Earth.

• C. float off into space.

• D. not jump as high as you do on Earth.

5. How does the sun’s gravity affect Earth?

• A. It causes objects to fall to Earth’s surface.

• B. It holds Earth in its orbit.

• C. It causes the moon to orbit the Earth.

• D. It causes objects on Earth to have weight.

6. The intense at the core of a star causes it to produce light.

• A. sound

• B. heat

• C. cold

• D. gravity

7. Why does only small part of a star’s light reach Earth?

• A. The sun absorbs most of the light.

• B. The atmosphere blocks most of the light.

• C. The light is destroyed by the darkness of space.

• D. The light spreads out as it moves through space.

8 Distances in space are so great, they are often measured in

• A. meters.

• B. light-years.

• C. feet per second.

• D. centimeters.

9. The sun has the

highest apparent brightness to Earth because it

• A. is closer to Earth than any other star.

• B. is larger than any other star.

• C. produces more light than other stars.

• D. is hotter than other stars.

10. Earth’s axis is an imaginary line that

• A. goes around the equator.

• B. traces Earth’s path through space.

• C. goes from the North Pole to the South Pole.

• D. extends from Earth to the sun.