Planet Quiz at a Glance
Planet Quiz is a free DodoThinks game about the 8 planets of the solar system. Name a planet from its picture, find it among all eight, or answer planet facts like which is the biggest, the hottest or the one with rings. Every answer comes with a fun fact. There is no timer and no sign up, so it suits kids and classrooms.
- Planets
- 8: Mercury to Neptune
- Rounds
- Which planet?, Click the planet, Planet facts
- Each round
- 8 planets, or 10 fact questions
- Time limit
- None
- Cost
- Free, no sign up
- Plays on
- Phone, tablet or computer
How to Play the Planet Quiz
- Pick a round. Which planet? shows a planet and four names. Click the planet shows all eight and asks for one. Planet facts asks questions like "Which is the hottest planet?"
- Answer at your own pace: there is no timer.
- After every answer a fun fact about the planet appears. Press Continue for the next question.
- At the end you get your score. Sign in with Google if you want it on the leaderboard.
What Makes It Different
- Drawn planets you can tell apart: Saturn's rings, Jupiter's red spot, the ice cap on Mars.
- Three kinds of questions, from recognising planets to knowing what makes each one special.
- Every answer teaches something, right or wrong, so a round is a short lesson.
- Teachers can set it as a class challenge and watch the scores come in live.
Our solar system has 8 planets, and each one has something that gives it away: rings, a red spot, a rusty colour or a tilt on its side. This planet quiz helps you learn all eight, first by sight, then by where they sit and what makes them special.
Rocky Planets, Gas Giants and Ice Giants
The rocky planets: Mercury, Venus, Earth and Mars are small worlds of rock and metal, closest to the Sun.
The gas giants: Jupiter and Saturn are huge balls of hydrogen and helium, with no solid ground to stand on.
The ice giants: Uranus and Neptune are made mostly of water, methane and ammonia ices, which give them their blue colour.
How to Remember the Planets
The order from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The easiest way to remember it is a sentence where each word starts with a planet's first letter: My Very Educated Mother Just Served Us Noodles.
The 8 Planets in Order from the Sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. A sentence to remember the order: My Very Educated Mother Just Served Us Noodles. For a chart with sizes, moons and years, and a game where you put them in order yourself, see Planets in Order.
- 1MercuryThe smallest planet and the closest to the Sun. A year there lasts just 88 Earth days.
- 2VenusThe hottest planet, at about 465 °C. It spins backwards, and its day is longer than its year.
- 3EarthThe only planet known to have life, with oceans covering about 71% of its surface.
- 4MarsThe Red Planet, coloured by rusty iron in its soil. Olympus Mons is the tallest volcano in the solar system.
- 5JupiterThe largest planet: over 1,300 Earths would fit inside it. The Great Red Spot is a storm bigger than Earth.
- 6SaturnFamous for its bright rings of ice and rock, and the planet with the most known moons: 293 by mid 2026.
- 7UranusIt spins on its side, tilted 98 degrees. It was the first planet found with a telescope, in 1781.
- 8NeptuneThe farthest planet from the Sun, with the fastest winds in the solar system. A year there lasts 165 Earth years.
Frequently Asked Questions
How many planets are there in the solar system?
There are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Is Pluto a planet?
Not any more. In 2006 the International Astronomical Union made Pluto a dwarf planet, because it has not cleared its orbit of other objects. It is still one of the best known worlds in the solar system.
What is the biggest planet?
Jupiter. It is about 11 times as wide as Earth, and over 1,300 Earths would fit inside it.
What is the smallest planet?
Mercury, which is only a little bigger than our Moon.
What order are the planets in?
From the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Remember it with "My Very Educated Mother Just Served Us Noodles."
Which planet has the most moons?
Saturn, with 293 known moons by mid 2026, NASA says. Jupiter is second with 115, and new small moons are still being found.
Is the planet quiz free?
Yes. It is free with no sign up and no timer, and it works on phones, tablets and computers.
Made by Kashif Sulehria in Lahore, Pakistan. Updated .