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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 is a galaxy?

Please select an answer first.

Correct answer: A

The correct answer is A large group of stars, gas, dust, and other matter held together by gravity.

  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: Galaxies are vast gravitational systems containing stars, planetary systems, gas, dust, and dark matter.
  3. Check the relationship: The correct choice is A large group of stars, gas, dust, and other matter held together by gravity.

Galaxies are vast gravitational systems containing stars, planetary systems, gas, dust, and dark matter.

2. QuestionMultiple choice

What is the Milky Way?

Please select an answer first.

Correct answer: B

The correct answer is The galaxy that contains our solar system.

  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: Our solar system is located in the Milky Way galaxy.
  3. Check the relationship: The correct choice is The galaxy that contains our solar system.

Our solar system is located in the Milky Way galaxy.

3. QuestionMultiple choice

Why do stars appear to have different colors?

Please select an answer first.

Correct answer: C

The correct answer is Their surface temperatures differ, causing them to emit different combinations of light..

  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: Star color is related to surface temperature, with hotter stars appearing more blue and cooler stars more red.
  3. Check the relationship: The correct choice is Their surface temperatures differ, causing them to emit different combinations of light..

Star color is related to surface temperature, with hotter stars appearing more blue and cooler stars more red.

4. QuestionMultiple choice

What information can a stars spectrum provide?

Please select an answer first.

Correct answer: D

The correct answer is Evidence about its composition, temperature, and motion.

  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: Patterns in a stars spectrum reveal elements and can indicate temperature and motion through the Doppler effect.
  3. Check the relationship: The correct choice is Evidence about its composition, temperature, and motion.

Patterns in a stars spectrum reveal elements and can indicate temperature and motion through the Doppler effect.

5. QuestionMultiple choice

Why do distant stars look like points of light?

Please select an answer first.

Correct answer: A

The correct answer is They are extremely far away, so their visible disks cannot be resolved easily 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: Even large stars appear point-like at great distances because their angular size is very small.
  3. Check the relationship: The correct choice is They are extremely far away, so their visible disks cannot be resolved easily from Earth..

Even large stars appear point-like at great distances because their angular size is very small.

6. QuestionMultiple choice

What is a light-year?

Please select an answer first.

Correct answer: B

The correct answer is A unit of distance equal to how far light travels in one year.

  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 light-year measures distance, not time, and is useful for describing very large astronomical distances.
  3. Check the relationship: The correct choice is A unit of distance equal to how far light travels in one year.

A light-year measures distance, not time, and is useful for describing very large astronomical distances.

7. QuestionMultiple choice

Why can observing distant galaxies show scientists the past?

Please select an answer first.

Correct answer: C

The correct answer is Light takes time to travel, so the light arriving now left those galaxies earlier..

  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: Because light has a finite speed, distant observations show objects as they were when their light began traveling.
  3. Check the relationship: The correct choice is Light takes time to travel, so the light arriving now left those galaxies earlier..

Because light has a finite speed, distant observations show objects as they were when their light began traveling.

8. QuestionMultiple choice

What does a telescope mainly help scientists do?

Please select an answer first.

Correct answer: D

The correct answer is Collect and analyze more light or other electromagnetic radiation from distant objects..

  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: Telescopes gather radiation and improve the ability to observe faint or distant objects.
  3. Check the relationship: The correct choice is Collect and analyze more light or other electromagnetic radiation from distant objects..

Telescopes gather radiation and improve the ability to observe faint or distant objects.

9. QuestionMultiple choice

Why are some space telescopes placed above Earths atmosphere?

Please select an answer first.

Correct answer: A

The correct answer is The atmosphere can absorb or distort some wavelengths of radiation..

  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: Placing a telescope above the atmosphere can improve observations in wavelengths that air absorbs or distorts.
  3. Check the relationship: The correct choice is The atmosphere can absorb or distort some wavelengths of radiation..

Placing a telescope above the atmosphere can improve observations in wavelengths that air absorbs or distorts.

10. QuestionMultiple choice

What can the repeated pattern of a planets transit across a star help reveal?

Please select an answer first.

Correct answer: B

The correct answer is The possible presence and orbital period of a planet around that star.

  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 regular dip in starlight during a transit can provide evidence of an orbiting exoplanet and its period.
  3. Check the relationship: The correct choice is The possible presence and orbital period of a planet around that star.

A regular dip in starlight during a transit can provide evidence of an orbiting exoplanet and its period.

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