Our Solar System

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

   Put these in order, starting with the one closest to the Sun.

   • Earth
   • Mercury
   • Mars
   • Jupiter
   • Uranus
   Show answer

   Mercury → Earth → Mars → Jupiter → Uranus

   Hint: Try: My Very Educated Mother Just Served Us Nachos (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune). The asteroid belt lies between Mars and Jupiter.

2. Question 2

   Which planet is closest to the Sun?

   • Earth
   • Mercury
   • Venus
   • Mars
   Show answer

   Mercury

   Hint: It's the smallest planet and it zips around the Sun in just 88 days.

3. Question 3

   Rocky planet or giant planet? Tap an item, then tap its basket.

   Sort into: 🪨 rocky planet · 🎈 giant planet

   • 🌍Earth
   • 🪐Saturn
   • 🟠Jupiter
   • 🔴Mars
   • 🟢Uranus
   • ⚪Mercury
   Show answer

   🪨 rocky planet: Earth, Mars, Mercury · 🎈 giant planet: Saturn, Jupiter, Uranus

   Hint: The four inner planets are small and rocky. The four outer planets are huge giants made mostly of gas and ice.

4. Question 4

   Which planet is the largest?

   🟠
   • Jupiter
   • Earth
   • Saturn
   • Neptune
   Show answer

   Jupiter

   Hint: This giant is so big that more than 1000 Earths could fit inside it.

5. Question 5

   Which planet is known as the Red Planet?

   🔴
   • Jupiter
   • Mars
   • Venus
   • Mercury
   Show answer

   Mars

   Hint: This planet, fourth from the Sun, has rusty red dust.

6. Question 6

   What is one astronomical unit (AU)?

   • the average distance from Earth to the Sun
   • the distance light travels in a year
   • the width of Earth
   • the distance across the Milky Way
   Show answer

   the average distance from Earth to the Sun

   Hint: Astronomers use Earth's distance from the Sun as a handy ruler for the solar system.

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