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Space and the Solar System Practice Tests

These Grade 8 Science practice tests cover the solar system, gravity, orbits, rotation and revolution, Earth-Moon-Sun patterns, seasons, phases, eclipses, tides, stars, galaxies, telescopes, exoplanets, and scale models.

Skills covered

  • Explaining how gravity and motion create orbits
  • Using Earth-Moon-Sun models to explain seasons, phases, eclipses, and tides
  • Comparing planets, moons, asteroids, comets, stars, and galaxies
  • Interpreting light, spectra, telescopes, and observations of distant objects
  • Evaluating scale models and evidence-based explanations of space systems

How to use these practice tests

Identify the objects, motion, force, light pattern, or scale relationship in each question. Then use the model to explain what an observer would see and what evidence supports the conclusion.

For more Grade 8 Science practice, return to the Grade 8 Science category.

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Grade 8 Space and the Solar System Practice Tests

Practice Grade 8 Science questions about the solar system, gravity, orbits, Earth-Moon-Sun patterns, stars, galaxies, observations, and space models.

Choose the best answer. Use gravity, motion, light, cycles, scale models, and observations to explain each space science situation.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What causes day and night on Earth?

Please select an answer first.

Correct answer: A

The correct answer is Earths rotation on its axis.

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: As Earth rotates, different locations face toward or away from the Sun, producing day and night.
  3. Check the relationship: The correct choice is Earths rotation on its axis.

As Earth rotates, different locations face toward or away from the Sun, producing day and night.

2. QuestionMultiple choice

What is the main cause of Earths seasons?

Please select an answer first.

Correct answer: B

The correct answer is Earths tilted axis as Earth revolves around the Sun.

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: The axial tilt changes the angle and duration of sunlight received by each hemisphere during the year.
  3. Check the relationship: The correct choice is Earths tilted axis as Earth revolves around the Sun.

The axial tilt changes the angle and duration of sunlight received by each hemisphere during the year.

3. QuestionMultiple choice

Why is it summer in one hemisphere while it is winter in the other?

Please select an answer first.

Correct answer: C

The correct answer is The tilted hemispheres receive different angles and lengths of sunlight at the same time..

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: When one hemisphere tilts toward the Sun, it receives more direct and longer-lasting sunlight while the other receives less.
  3. Check the relationship: The correct choice is The tilted hemispheres receive different angles and lengths of sunlight at the same time..

When one hemisphere tilts toward the Sun, it receives more direct and longer-lasting sunlight while the other receives less.

4. QuestionMultiple choice

What causes the phases of the Moon?

Please select an answer first.

Correct answer: D

The correct answer is The changing portion of the Moons sunlit half that is visible from Earth.

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: As the Moon orbits Earth, observers see different portions of its sunlit half.
  3. Check the relationship: The correct choice is The changing portion of the Moons sunlit half that is visible from Earth.

As the Moon orbits Earth, observers see different portions of its sunlit half.

5. QuestionMultiple choice

What is a solar eclipse?

Please select an answer first.

Correct answer: A

The correct answer is The Moon moves between the Sun and Earth and blocks some sunlight from reaching Earth..

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: A solar eclipse occurs when the Moon alignment places its shadow on part of Earth.
  3. Check the relationship: The correct choice is The Moon moves between the Sun and Earth and blocks some sunlight from reaching Earth..

A solar eclipse occurs when the Moon alignment places its shadow on part of Earth.

6. QuestionMultiple choice

What is a lunar eclipse?

Please select an answer first.

Correct answer: B

The correct answer is Earth moves between the Sun and Moon and Earths shadow falls on the Moon..

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: A lunar eclipse occurs when the Moon passes through Earths shadow during a suitable alignment.
  3. Check the relationship: The correct choice is Earth moves between the Sun and Moon and Earths shadow falls on the Moon..

A lunar eclipse occurs when the Moon passes through Earths shadow during a suitable alignment.

7. QuestionMultiple choice

Why do solar and lunar eclipses not happen every month?

Please select an answer first.

Correct answer: C

The correct answer is The Moons orbit is tilted, so the three objects are not aligned exactly every month..

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: The orbital tilt usually prevents the Sun, Earth, and Moon from lining up closely enough for an eclipse.
  3. Check the relationship: The correct choice is The Moons orbit is tilted, so the three objects are not aligned exactly every month..

The orbital tilt usually prevents the Sun, Earth, and Moon from lining up closely enough for an eclipse.

8. QuestionMultiple choice

What causes ocean tides mainly?

Please select an answer first.

Correct answer: D

The correct answer is The gravitational pulls of the Moon and the Sun on Earths oceans.

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: The Moon is the main influence on tides, with the Suns gravity also contributing.
  3. Check the relationship: The correct choice is The gravitational pulls of the Moon and the Sun on Earths oceans.

The Moon is the main influence on tides, with the Suns gravity also contributing.

9. QuestionMultiple choice

Why does the same side of the Moon often face Earth?

Please select an answer first.

Correct answer: A

The correct answer is The Moons rotation period matches its orbital period around Earth..

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: Synchronous rotation means the Moon turns once during each orbit, keeping one hemisphere facing Earth.
  3. Check the relationship: The correct choice is The Moons rotation period matches its orbital period around Earth..

Synchronous rotation means the Moon turns once during each orbit, keeping one hemisphere facing Earth.

10. QuestionMultiple choice

What is the best explanation for the length of a year on Earth?

Please select an answer first.

Correct answer: B

The correct answer is The time Earth takes to complete one revolution around the Sun.

  1. Identify the space system: Determine whether the question concerns an object, orbit, gravity, light, a cycle, a scale model, or evidence from observation.
  2. Use the scientific model: A year is defined by Earths orbital revolution around the Sun.
  3. Check the relationship: The correct choice is The time Earth takes to complete one revolution around the Sun.

A year is defined by Earths orbital revolution around the Sun.

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