Solar System Quiz

Solar System Quiz: 9 Quizzes, 90 Verified Questions

Can the solar system fit into one quiz? Almost. Here on Quizoland, you'll find nine solar system quizzes and 90 fact-checked questions about the Sun, the eight planets, the moons, the asteroid belt, and the major space missions. This page belongs to our science quiz category and offers three levels — easy, medium, and hard. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune: all eight planets are here, with their orbits, rings, and moons. Play right in your browser — no sign-up, no cost.

The Eight Planets, From Closest to Farthest

Mercury completes its orbit in 88 days, Neptune in nearly 165 years. Between them lie six other very different worlds: Venus with its CO₂ atmosphere, Earth with its oceans, Mars with its polar ice caps, Jupiter with its Great Red Spot, Saturn with its rings, and Uranus tilted at 98 degrees. The easy questions cover the order of the planets and their nicknames (the Red Planet, the gas giants). The medium and hard levels dig into orbital periods, distances in astronomical units, and atmospheric compositions. Since 2006, Pluto has no longer been part of this group of eight.

The Sun, Moons, Asteroid Belt, and Dwarf Planets

The Sun accounts for about 99.8% of the system's mass. More than 200 known moons orbit around it: Earth's Moon, of course, but also Ganymede (the largest moon in the solar system, bigger than Mercury), Titan with its methane lakes, and Europa with its ocean beneath the ice. The main asteroid belt lies between Mars and Jupiter and is home to Ceres. Beyond Neptune, the Kuiper Belt holds Pluto, Haumea, Makemake, and Eris — the five dwarf planets officially recognized by the International Astronomical Union.

Probes, Missions, and Milestones in Exploration

Sputnik 1 (1957), Apollo 11 (1969), the Voyager probes (1977), Galileo orbiting Jupiter, Cassini circling Saturn for 13 years, Rosetta and Philae landing on comet 67P/Churyumov–Gerasimenko in 2014, New Horizons flying past Pluto in 2015: these major missions run through this topic like a thread. The hard level tests exact dates, the agencies behind each mission, and their scientific goals.

A Timeline Format for a Change

Looking for a tougher challenge? Our timeline quizzes ask you to put events in order — perfect for the major space missions. The free-entry quiz format drops the multiple-choice options: you type the name of the moon, probe, or planet yourself.

Score, Timer, and Overall Leaderboard

Every quiz is timed, and your score gets added to Quizoland's overall leaderboard. You can compare your results with other players and climb the rankings question by question. For a daily fix, check out the quiz of the day: a fresh pick every morning, covering every topic.

Going Further in Science

The solar system is just a starting point. Our science quiz section will gradually expand into other fields — biology, chemistry, physics — with the same commitment to verified sources. In the meantime, work your way through the nine quizzes on this page, then try the quiz of the day to keep the fun going.