Chapter 4 Space 4th Grade

Which is the smallest planet in our solar system?

• Uranus

• Mercury

• Earth

• Venus

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For many years scientists thought Saturn was the only planet with rings. We now know that all gas giants have rings. This new knowledge led to a change in understanding. This is an example of the -

• independent variables

• computer sciences

• nature of science

• engineering design process

Which planet is the only planet in our solar system to spin on its side?

• Uranus

• Neptune

• Mars

• Venus

Pluto is no longer included on the list of planets in our solar system because of its small size and —

• blue color

• thin atmosphere

• distance from the sun

• irregular orbit

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Which statement correctly describes the size and age of the sun?

• The sun is 10 times the diameter of Earth and about 2.5 million years old.

• The sun is 50 times the diameter of Earth and about 2.5 billion years old.

• The sun is 110 times the diameter of Earth and about 4.6 billion years old.

• The sun is 150 times the diameter of Earth and about 4.6 million years old.

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What does Earth’s protective atmosphere help to block out?

• Meteors and asteroids

• Enormous atmospheric storms

• Orbiting satellites

• Damaging rays from the sun

What is the name for the moon phase in the box below?

• New moon

• First quarter

• Full moon

• last quarter

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What causes the seasons on Earth?

• The Earth’s axial tilt as it revolves around the sun

• The rotation of the moon as it revolves around Earth

• The rotation of the Earth as the moon revolves around it

• The tilt of Earth as it rotates each day

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How long does it take Earth to make one revolution around the sun?

• 28 ½ days

• 24 hours

• 365 ¼ days

• 1 month

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This model of the solar system shows —

• what astronomers today believe about our solar system

• what early astronomers believed about our solar system

• the correct order of planets in our solar system

• the correct sizes of planets in our solar system

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