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8th grade · Science · Unit 8 of 9

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.

Washington State Learning Standards learning standard: MS-ESS1-1; MS-ESS1-2; MS-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

    What holds the solar system together?

    • Air
    • Magnetism
    • Friction
    • Gravity

  2. Question 2

    A full moon happens when the moon is…

    • between Earth and the sun
    • behind the sun
    • very close to Earth
    • on the opposite side of Earth from the sun

  3. Question 3

    An astronomical unit (AU) is the distance from…

    • Earth to the moon
    • one galaxy to another
    • Earth to the sun
    • the sun to Pluto

  4. Question 4

    A lunar eclipse happens when…

    • the sun blocks the moon
    • the moon blocks the sun
    • Earth's shadow falls on the moon
    • clouds hide the moon

  5. Question 5

    Galaxies are held together by…

    • friction
    • magnetism
    • wind
    • gravity

  6. Question 6

    Why don't we have an eclipse every month?

    • The moon stops
    • The sun moves away
    • The moon's orbit is tilted compared to Earth's
    • The moon has no shadow

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