Test your knowledge of space, planets, clusters, nebulae & the cosmos!
SELECT DIFFICULTY
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CADET
20 sec · 3 lives Basic solar system
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EXPLORER
15 sec · 3 lives Deep space topics
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COMMANDER
10 sec · 2 lives Clusters & nebulae
— MISSION HALL OF FAME —
No scores yet — be the first commander!
15SEC
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QUESTION
1/10
🌌 SPACE & ASTRONOMY
STREAK
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Loading question…
💡 SPACE FACT
🔭 RELATED OBJECTS IN THIS CLUSTER
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A
0
SCORE
0/10
CORRECT
0
BEST STREAK
Well done!
// HOW TO PLAY
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READ THE QUESTION
Each question is about space, planets, moons, stars, or astronomy. Read carefully — some questions are tricky!
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ANSWER FAST
A timer counts down for each question. Faster answers earn more points. Wrong answers or timeouts break your streak.
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BUILD STREAKS
Consecutive correct answers build your combo. Streaks multiply your score per question — try not to break the chain!
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TOP THE LEADERBOARD
Submit your name at the end of a round to save your score. Play on harder difficulty for more points per question.
FAQ
What topics does Planet Quiz cover? ▾
The 8 planets and their properties (size, moons, temperature), dwarf planets including Pluto, famous moons like Europa and Titan, stars, constellations, black holes, space missions, and astronomy facts.
Is Planet Quiz free? ▾
100% free — no ads, no login, no download. Works in any browser on phone or desktop. Submit your score to the global leaderboard after each round.
How many difficulty levels are there? ▾
Multiple difficulty levels — Easy focuses on basic solar system facts everyone knows, Medium adds moons and missions, Hard brings in advanced astrophysics and obscure astronomy details. Each level also has a shorter timer.