The Solar System Quiz

Grade 4 · Science · Quiz

Test your knowledge of the planets and other objects in our solar system.

Questions

1. Which is the correct order of the first four planets from the Sun?

   1. Mercury, Venus, Earth, Mars
   2. Venus, Mercury, Mars, Earth
   3. Earth, Mercury, Venus, Mars
   4. Mars, Earth, Venus, Mercury
   Show answer

   Answer: Mercury, Venus, Earth, Mars

   The order from the Sun is Mercury, Venus, Earth, Mars. A memory trick: My Very Excellent Mother Just Served Us Nachos.

2. Which planet is the largest in our solar system?

   1. Saturn
   2. Neptune
   3. Jupiter
   4. Uranus
   Show answer

   Answer: Jupiter

   Jupiter is the largest planet in the solar system. It is so large that all other planets could fit inside it with room to spare.

3. What type of objects are found in the asteroid belt between Mars and Jupiter?

   1. Comets
   2. Moons
   3. Rocky asteroids
   4. Gas clouds
   Show answer

   Answer: Rocky asteroids

   The asteroid belt between Mars and Jupiter contains millions of rocky objects called asteroids that orbit the Sun.

4. What makes Earth unique compared to all other known planets?

   1. It is the largest planet
   2. It has rings
   3. It is closest to the Sun
   4. It supports known life and has liquid water
   Show answer

   Answer: It supports known life and has liquid water

   Earth is the only planet known to have liquid water on its surface and to support life. Its position and atmosphere create just the right conditions.

5. A comet develops a bright, glowing tail when it:

   1. Passes close to another planet
   2. Travels close to the Sun
   3. Enters the asteroid belt
   4. Moves away from the solar system
   Show answer

   Answer: Travels close to the Sun

   When a comet approaches the Sun, solar heat vaporizes the ice, creating a glowing coma and tail of gas and dust that points away from the Sun.

6. How long does it take Earth to complete one full orbit around the Sun?

   1. One day
   2. One month
   3. One year
   4. One decade
   Show answer

   Answer: One year

   Earth completes one full orbit around the Sun in approximately 365.25 days, which defines one year.

7. Mercury is the closest planet to the Sun.

   Show answer

   Answer: True

   Mercury is the closest planet to the Sun. Despite being closest, it is not the hottest planet; Venus holds that record due to its thick atmosphere.

8. Jupiter, Saturn, Uranus, and Neptune are called gas ______ because they are large planets made mostly of gas.

   Show answer

   Answer: giants

   Jupiter, Saturn, Uranus, and Neptune are called gas giants because they are enormous planets composed mainly of hydrogen and helium gas rather than solid rock.

Get a personalized course on The Solar System built around your child.