Cosmic Quest · Free family challenge
How well do you know the Solar System?
Take eight quick questions about planets, the Sun, and our Moon. Every answer includes a short explanation, so this is a learning mission—not a test. No timer, account, or score tracking.
Ready for launch?
Choose the answer you think is right. You'll get a friendly explanation after each question, and your final score stays right here in this session.
Made for curious kids, parents, students, and teachers. Guessing is part of discovery.
Your discovery collection
0 of 8 discoveries earned · Answer correctly to collect planet badges.
Mission debrief
Your cosmic score
0 / 8
Keep your curiosity going: visit a world in the 3D explorer, then play again to get a new question order.
Turn a question into an exploration
Use the interactive 3D Solar System to visit planets and moons, then read more in the Solar System activity guide or the planet order guide.
Reliable astronomy references
These questions use basic Solar System facts. Keep learning with NASA's planet sizes and order guide, NASA's guide to the Solar System and light travel, and NASA's Solar System facts.