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Quick TrainerPlanets and Major Moons of the Solar System
Test your knowledge of the planets, their moons, and key facts about our solar system.
Science32 items3 levelsDifficulty 2/5
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Levels
Start easy — harder levels unlock as you improve, or jump ahead anytime.
1
Planet Basics
10 items
2
Moons & Features
10 items
3
Advanced Facts
12 items
All 32 cards
Which planet is closest to the Sun?
Mercury
Which planet is known as the Red Planet?
Mars
Which is the largest planet in the solar system?
Jupiter
Which planet is famous for its prominent ring system?
Saturn
On which planet do we live?
Earth
Which planet is the hottest in the solar system?
Venus
Which planet is the farthest from the Sun?
Neptune
How many planets are in the solar system?
8
Which planet is famous for being tilted on its side?
Uranus
What is the name of Earth's only natural satellite?
The Moon
What is the name of Jupiter's largest moon (and the largest in the solar system)?
Ganymede
What is the name of Saturn's largest moon, which has a thick atmosphere?
Titan
What are the names of the two moons of Mars?
Phobos and Deimos
Which Jupiter moon is the most volcanically active body in the solar system?
Io
Which icy moon of Jupiter is thought to have a subsurface ocean?
Europa
What is the name of the largest volcano in the solar system, located on Mars?
Olympus Mons
Which planet has the most moons (as currently known)?
Saturn
Which planet's largest moon, Triton, orbits in the opposite direction of the planet's rotation?
Neptune
What is the name of the giant storm on Jupiter?
Great Red Spot
Which dwarf planet was reclassified from planet status in 2006?
Pluto
What are Jupiter's four largest moons collectively called?
Galilean moons
Which Saturn moon shoots water-ice geysers from its south pole?
Enceladus
What is the largest moon of Pluto?
Charon
Which planet has the shortest day (fastest rotation)?
Jupiter
Which planet has the longest day, longer than its own year?
Venus
What is the name of the asteroid belt's largest object, a dwarf planet?
Ceres
Which planet rotates clockwise (retrograde), opposite to most planets?
Venus
What is the approximate number of Earth years it takes Neptune to orbit the Sun?
165
Which two planets have no moons?
Mercury and Venus
What is the name of the largest moon of Uranus?
Titania
Which gas giant has the strongest winds in the solar system?
Neptune
What is the dwarf planet beyond Pluto whose discovery prompted Pluto's reclassification?
Eris
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