Exploring Our Solar System
Like Duolingo, but for Exploring Our Solar System. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
Free during early access · No credit card · iPhone & Android

You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo turns Exploring Our Solar System into a game you actually finish. Levels, streaks, and quick quizzes that make it stick. Five minutes a day.
Where Exploring Our Solar System takes you
Take a trip through space to meet our sun and the planets that circle it. Learn what makes each world special and how we explore the stars from Earth.
- 1
Our Neighborhood in Space
- The Sun: Our Big Bright Star
- Gravity: The Invisible Glue
- Orbits and How Planets Move
- The Order of the Planets
- 2
The Inner Rocky Worlds
- Mercury: The Small Hot Planet
- Venus: The Brightest Neighbor
- Earth: Our Perfect Home
- The Moon: Earth's Best Friend
- Mars: The Dusty Red Planet
- The Asteroid Belt
- 3
The Giant Outer Planets
- Jupiter: The King of Planets
- Saturn: The One with Rings
- Uranus and Neptune: The Ice Giants
- 4
Beyond the Big Planets
- Pluto and the Dwarf Planets
- Comets: Snowy Space Rocks
- The Edge of Our System
- How We Use Telescopes
- Sending Robots to Space
4 sections · 18 units · 54 levels. Built to play, not to enroll.
Here's what playing it feels like
A real question from this course. Take your best guess.
If we put all the 'stuff' in space on a scale, which giant object would take up almost the whole side?
Get it right to open this lesson and 53 more in the app.
You pick the voice
Exploring Our Solar System is taught in the Explain Like I'm 5 style: no big words. promise.. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Exploring Our Solar System today.
Download Tomo, search Exploring Our Solar System, and play your first lesson in under a minute.