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8th grade · Science · Unit 7 of 8

Space Systems

Moon phases, eclipses, seasons, gravity and scale.

What your child practices

Practices models of the Earth-sun-moon system (phases, eclipses, seasons), the role of gravity in the solar system and galaxies, and the scale of objects in the solar system.

Oregon State Standards learning standard: 8.ESS1.1; 8.ESS1.2; 8.ESS1.3 · the Earth-sun-moon system, gravity in the solar system, and its scale

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which is the largest planet?

    • Mars
    • Jupiter
    • Mercury
    • Earth

  2. Question 2

    A solar eclipse happens when…

    • the moon disappears
    • the sun passes behind Earth
    • the moon passes between the sun and Earth
    • Earth passes between the sun and moon

  3. Question 3

    Galaxies are held together by…

    • gravity
    • wind
    • friction
    • magnetism

  4. Question 4

    Seasons happen because…

    • Earth gets closer to the sun in summer
    • Earth's axis is tilted
    • the moon blocks light
    • the sun turns up

  5. Question 5

    When the Northern Hemisphere tilts toward the sun, it has…

    • winter
    • fall
    • summer
    • no season

  6. Question 6

    Planets farther from the sun take longer to orbit because…

    • gravity is stronger farther away
    • they have a longer path and move more slowly
    • they are heavier
    • they spin faster

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