Tap the Sun and the eight planets to see their order, relative size, and moons. Switch between easy-to-tap view and true size comparisons, then test your memory with quick practice games. Progress stays in this browser.
Scale sizes, planet order, moons, and tips for parents and young astronomers.
On iPad and phones, tap any planet disc to inspect it. Discs have comfortable hit areas so small planets like Mercury are easy to tap even in scale mode. Tap anywhere on the workspace to unlock sound effects.
Our Solar System begins with the Sun at the center, followed by four rocky inner planets (Mercury, Venus, Earth, Mars) and four gas and ice giant outer planets (Jupiter, Saturn, Uranus, Neptune).
Pretty sizes keeps all planets large enough to see and tap comfortably. Closer to scale shrinks Mercury, Earth, and Mars while expanding Jupiter and Saturn to show the staggering size gap between rocky planets and gas giants.
Practice offers four focused games: Order asks you to arrange scrambled planets from 1 to 8; Closer tests distance comparisons; Bigger tests diameter recall; and Seasons asks which season a hemisphere has in a given month. Each mode tracks your correct answers locally.
Start in Explore. Find our home Earth, then spot the rings of Saturn and giant Jupiter. Use a mnemonic like My Very Educated Mother Just Served Us Noodles to remember the first letters.
Pluto was reclassified as a dwarf planet in 2006 because it shares its orbit with many other icy objects in the Kuiper Belt. Our solar system has eight primary planets.
Next labs in this group. Everything runs in your browser.
It is a free interactive web tool designed for beginners to learn about the Sun and eight planets. Explore a circular orbit map with a year clock, zoom into each body, compare sizes on the linear strip, and play practice games. All progress stays in your browser with no account needed.
Hands-on exploration allows learners to build visual mental models of planet positions, colors, and sizes before being quizzed. Tapping each body reveals key facts naturally.
True space scales are extreme: if Jupiter were the size of a basketball, Mercury would be smaller than a grain of rice and invisible on a mobile screen. Pretty sizes keeps all planets easy to tap, while Closer to scale provides the dramatic visual comparison.
Astronomers officially classify eight major planets orbiting the Sun. Pluto is recognized as a dwarf planet alongside Ceres and Eris. This tool focuses on the eight primary planets.
Practice mode offers four self-paced games: ordering all eight planets from 1 to 8, choosing which of two planets is closer to the Sun, picking which of two planets is larger, and naming the season in the northern or southern hemisphere for a given month.
Your correct answers and attempt counts are stored locally in your browser's local storage. No data is sent to external servers.
It is created for curious beginners discovering the Solar System for the first time.
This tool does not simulate complex 3D gravitational orbital mechanics, astrology, constellations, or planetary coordinate math. It focuses strictly on core planetary literacy.
Processed locally in your browser. Your files are never uploaded to our servers.