Planets
Explore the planets of our Solar System with quizzes that cover orbits, atmospheres, moons, and key discoveries. You’ll review the inner and outer planets, plus how scientists classify and compare them using real mission findings.
Quizzes
Gas giants: Jupiter and Saturn basics
Tour the Solar System’s two biggest worlds with this Jupiter and Saturn basics quiz. You’ll review core facts about their atmospheres, rings, moons, and magnetospheres, plus the key differences between the two gas giants. With mixed difficulty, it works for quick refreshers and deeper self-checks.
Ice giants: Uranus and Neptune facts
Explore the Solar System’s ice giants with a focused set of facts about Uranus and Neptune. You’ll review atmospheres, rings, moons, discovery history, and key missions—plus the oddities that make these planets stand out. Choose your preferred difficulty and number of questions, then play at your own pace.
Inner planets: Mercury, Venus, Earth, and Mars
Explore the rocky worlds closest to the Sun with this Inner Planets quiz covering Mercury, Venus, Earth, and Mars. Expect a mixed set of facts, comparisons, and mission-ready details. Choose your preferred difficulty and question count, then learn at your own pace with no timer.
What you'll find here
- Curated quizzes focused on Planets
- Difficulty spread from easy to hard
- Randomized questions with instant feedback
- Quizzes you can replay and compare on the leaderboard
Category FAQ
How many quizzes are available?
There are 3 quizzes with 347 questions total.
Do the Planets quizzes have a timer?
No. Each question has 4 options and there is no timer, so you can answer at your own pace.
What topics are covered in these Planets quizzes?
They cover planet order, orbits, size and composition, atmospheres, rings, moons, and notable missions and discoveries.
Are the quizzes suitable for beginners?
Yes. The set includes a mix of difficulty and quiz length, so you can start with easier questions and build up.
Do these quizzes include dwarf planets like Pluto?
Some questions may mention dwarf planets for context, but the main focus is the eight planets and how they compare.
More to explore
What you’ll practice
These Planets quizzes help you identify each planet’s defining features, from size and composition to rings, moons, and weather. You’ll also practice comparing planets using concepts like gravity, distance from the Sun, and orbital periods.
How the quizzes work
Each question has 4 answer options, and there’s no timer, so you can focus on accuracy and learning. Quiz difficulty and length vary across the set, so you can start with quick refreshers and move to longer, more detailed question sets as you improve.
Planet context and quick facts
The Solar System’s planets fall into two main groups: rocky terrestrial worlds (Mercury, Venus, Earth, Mars) and giant planets (Jupiter, Saturn, Uranus, Neptune). A useful context point: Uranus rotates on its side, and Venus spins so slowly—and in the opposite direction of most planets—that its day is longer than its year.
Tips for better scores
- Learn the order of the planets and approximate distances from the Sun
- Know which planets have rings and which have the largest moon systems
- Compare atmospheres: thick CO₂ (Venus), thin CO₂ (Mars), hydrogen/helium giants
- Watch for “extremes” questions (hottest, largest, windiest, most tilted axis)
- Use missions and discoveries as clues (Voyager, Cassini, Juno, New Horizons)
Who this category is for
These quizzes fit students, educators, and curious learners who want a structured way to review planetary science. They’re also useful for general astronomy revision, since many questions connect basic facts to real observations and space missions.