Guest Player
0 pts #- Global Ranking Not on the leaderboard - add your name

Planet Spotter Solar System Game

Planet sizes are to scale with each other. The Sun and the distances are not.
New space game

Planet Spotter

Spot the planets, crack the riddles and race the clock across a living 3D Solar System.

8 planets 10 questions Speed bonus Streaks
or press Enter
Drag to rotate Scroll or pinch to zoom Tap a planet to answer

Leaderboard

Best score per player

No scores yet. Be the first on the board!

Planet Spotter

How to play Planet Spotter

  1. 1

    Spin the Solar System

    Drag to turn the 3D view and zoom in on any planet. The planets keep moving along their orbits, just slower while a question is open.

  2. 2

    Answer 10 questions

    Find a planet with the labels off, solve a riddle like "Which planet is the hottest?" or pick the bigger of two glowing planets.

  3. 3

    Be quick, keep a streak

    Every right answer scores 100, plus up to 50 for speed. Three in a row multiply your points by 1.2, five in a row by 1.5.

The planets at a glance

Every fact card in the game comes from this table. Distances are averages from the Sun, days are one full spin, and years are one trip around the Sun.

PlanetTypeDiameterFrom the SunDayYearMoons
Mercury Rocky planet 4,879 km 58 million km 59 days 88 days 0
Venus Rocky planet 12,104 km 108 million km 243 days 225 days 0
Earth Rocky planet 12,742 km 150 million km 24 hours 365 days 1
Mars Rocky planet 6,779 km 228 million km 24 h 37 min 687 days 2
Jupiter Gas giant 139,820 km 778 million km 9 h 56 min 11.9 years 95+
Saturn Gas giant 116,460 km 1.4 billion km 10 h 34 min 29.5 years 274
Uranus Ice giant 50,724 km 2.9 billion km 17 h 14 min 84 years 28
Neptune Ice giant 49,244 km 4.5 billion km 16 h 6 min 165 years 16

More space games

Space & ExplorationTen questions on planets, moons, famous missions, and milestones in spaceflight - beat the clock and join the leaderboard. Moon & Lunar ScienceTen questions on phases, Apollo, lunar geology, eclipses, and how the Moon shapes Earth - beat the clock and join the leaderboard. Mars & the Red PlanetTen questions on Martian geology, atmosphere, seasons, pioneering landers and rovers, moons and famous missions - timed quiz with leaderboard.

About Planet Spotter

Planet Spotter is a free space game that turns the Solar System into a playground. Instead of reading a list, you look for Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune as they orbit the Sun in 3D, and learn something new after every answer.

It works for kids and adults alike: the questions mix easy finds with trickier riddles about moons, days and temperatures, and the Real sizes button shows just how tiny Earth is next to Jupiter.

Frequently asked questions

Is Planet Spotter free?

Yes. You can play as often as you like without an account. With a player name your best score appears on the leaderboard.

How are points scored?

A right answer is worth 100, plus up to 50 for speed. A streak of 3 multiplies it by 1.2 and a streak of 5 by 1.5. Using a hint halves the points for that question.

Are the planet sizes to scale?

In the game view the small planets are drawn bigger so you can tap them. Switch to Real sizes to see the planets at their true size compared with each other. The Sun and the distances stay out of scale, or Neptune would be far off screen.

Which planet is the hottest?

Venus, at about 464 °C on average. Mercury is closer to the Sun, but it has no thick atmosphere to trap the heat.

How many moons does Saturn have?

274 known moons, the most of any planet. Jupiter comes second with more than 95.