How it works
This space trivia for kids has 45 questions in three sets: the planets, the Sun and Moon with comets and eclipses, and stars and space travel. Every answer comes with a short reason.
Read the full guide
Three sets
The planets asks which is biggest, hottest or spins on its side. Sun, Moon and small bodies covers phases, tides, eclipses and Halley's Comet. Stars and space travel runs from the Big Dipper to Apollo 11 and the space station.
For a class or family quiz
Print, with a tick on With answer key, gives a paper round to read out. Pick one set per round, or leave the menu on every topic for a mix. Teams can take turns, one question each, and keep score on paper.
- Mercury is closest to the Sun, but Venus is hotter: its thick clouds trap the heat.
- Never look straight at the Sun, even in an eclipse, without proper eclipse glasses.
Questions and answers
What ages is this space quiz for?
Ages 7 to 12, roughly grades 2 to 6. The planet set is the easiest place to start. That band is our judgement, not a published standard.
Are the answers checked?
Yes. Planet facts come from NASA's planetary fact sheet and the rest from the Wikipedia article named under each answer, checked in September 2026.
Why is there no question about how many moons Saturn has?
Astronomers keep finding new small moons around the giant planets, so any count would soon be out of date. The quiz leaves out counts that change and asks facts that stay true.