The Solar System Quiz

Grade 5 · Science · Quiz

Test your knowledge of planets, orbits, moons, and our place in space.

Questions

  1. How many planets are in our solar system?

    1. 7
    2. 8
    3. 9
    4. 10
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    Answer: 8

    There are 8 planets. Pluto was reclassified as a dwarf planet in 2006.

  2. Mercury is the hottest planet in the solar system.

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    Answer: False

    Venus is actually the hottest planet (about 900°F) because its thick atmosphere traps heat. Mercury, though closer to the Sun, has almost no atmosphere.

  3. Which planet is known for its spectacular ring system?

    1. Jupiter
    2. Uranus
    3. Saturn
    4. Neptune
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    Answer: Saturn

    Saturn has the most visible and spectacular rings, made of ice and rock chunks.

  4. The ___ is the star at the center of our solar system.

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    Answer: Sun

    The Sun is a medium-sized star that provides the gravity, light, and heat that make our solar system possible.

  5. What is the smallest planet in the solar system?

    1. Mars
    2. Mercury
    3. Pluto
    4. Venus
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    Answer: Mercury

    Mercury is the smallest planet with a diameter of about 3,032 miles.

  6. All planets in our solar system have at least one moon.

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    Answer: False

    Mercury and Venus have no moons at all. Earth has one, Mars has two, and the outer planets have many.

  7. Which planet is farthest from the Sun?

    1. Saturn
    2. Uranus
    3. Neptune
    4. Jupiter
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    Answer: Neptune

    Neptune is the farthest planet from the Sun at about 2.8 billion miles away.

  8. A ___ is an icy object that develops a glowing tail when it passes close to the Sun.

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    Answer: comet

    Comets are icy bodies from the outer solar system. As they near the Sun, ice vaporizes and forms a bright tail.

  9. Jupiter is larger than all other planets combined.

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    Answer: True

    Jupiter's volume is so enormous that all seven other planets could fit inside it with room to spare.

  10. About how long does it take Earth to orbit the Sun once?

    1. 24 hours
    2. 28 days
    3. 365 days
    4. 10 years
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    Answer: 365 days

    Earth takes 365.25 days to orbit the Sun. We account for the extra quarter day with a leap year every four years.

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