10 free The Solar System trivia questions with answers — trivia quiz, new questions added Aug 2026.
The Sun accounts for 99.86% of all mass in our entire solar system, yet it's still losing weight every second. See how well you actually know the planets, moons, and cosmic neighbors that share our cosmic neighborhood.
All 10 questions with answers and explanations. Play the quiz
Q 01Which planet is known for its prominent ring system?
Saturn
Saturn's ring system is the most extensive and visually striking in our solar system, composed of countless ice particles and rocky debris. All four gas giants have rings, but Saturn's are by far the most prominent.
Q 02What is the largest moon in our solar system?
Ganymede
Ganymede, a moon of Jupiter, is larger than the planet Mercury and is the only moon in the solar system known to have its own magnetic field. [3, 11, 18, 22]
Q 03Which planet is closest to the Sun?
Mercury
Mercury is the innermost planet and the smallest planet in our solar system, orbiting the Sun every 88 Earth days. [1, 14, 17]
Q 04What is the largest volcano in the solar system?
Olympus Mons
Olympus Mons is a massive shield volcano located on Mars, standing approximately 22 kilometers (14 miles) high, making it the tallest mountain and largest volcano known in the solar system. [7, 10, 15]
Q 05Which dwarf planet was reclassified from a planet in 2006?
Pluto
In 2006, the International Astronomical Union (IAU) redefined the term 'planet,' leading to Pluto's reclassification as a dwarf planet. [2, 48]
Q 06What is the primary gaseous component of the Sun?
Hydrogen
The Sun is a star composed primarily of hydrogen, which undergoes nuclear fusion in its core to produce energy, and a smaller percentage of helium.
Q 07How many giant planets are in our solar system?
4
There are four giant planets in our solar system: Jupiter, Saturn, Uranus, and Neptune. Jupiter and Saturn are classified as gas giants, while Uranus and Neptune are ice giants. [2, 4, 20, 39]
Q 08What is the asteroid belt located between Mars and Jupiter called?
Main Asteroid Belt
The Main Asteroid Belt is a region of space between the orbits of Mars and Jupiter that contains millions of asteroids. [6, 21, 23, 24]
Q 09Which planet is known for its Great Red Spot?
Jupiter
Jupiter's Great Red Spot is a persistent, enormous storm system, larger than Earth, that has raged in the planet's atmosphere for centuries. [27, 31, 35, 43]
Q 10What force keeps planets in orbit around the Sun?
Gravity
Gravity is the fundamental force of attraction between any two objects with mass, and the Sun's immense gravity keeps the planets in their elliptical orbits. [26, 33, 36]