The Mechanics of Space
Move beyond basic planet trivia to understand orbital dynamics, stellar engines, and the geometry of the cosmos. Discover how spacecraft navigate the void, how stars forge matter, and what drives cosmic expansion.
Like Duolingo, but for The Mechanics of Space. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
25 levels across 4 sections, about 50 minutes end to end, roughly 10 days at five minutes a day. It moves through Navigating the Void, Planetary Systems and Dynamics, Stellar Engines and Extreme Matter, and The Expanding Architecture. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in The Mechanics of Space
- Earth's gravity at ISS altitude is still roughly 90% as strong as on the ground.
- Astronauts float because the station and its crew fall together freely around Earth.
- Apparent weightlessness requires continuous freefall, not the absence of gravity.
- Reaching orbit requires roughly 7.8 km/s of sideways speed, not just altitude.
- Without horizontal velocity, an object falls straight back to Earth along a vertical path.
- Orbital trajectory occurs when forward speed makes Earth's surface curve away as fast as you fall.
- Firing retrograde slows horizontal speed, which lowers the opposite side of the orbit.
- Burning radially inward toward Earth only rotates the orbital ellipse inefficiently.
- Orbital mechanics requires altering forward speed along the velocity vector to change height.
- An initial prograde burn raises the apogee to match the target higher orbit's altitude.
- The spacecraft coasts along an elliptical transfer path without using engine thrust.
- A second prograde burn at apogee circularizes the orbit at the new, higher altitude.
- Thin atmospheric gas in low Earth orbit creates continuous drag that bleeds orbital energy.
- Solar activity heats the thermosphere, causing atmospheric gases to expand outward into orbital paths.
- Larger frontal surface area increases drag force, accelerating the rate of orbital decay.
- In a vacuum, heat cannot transfer via convection or conduction to the outside environment
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 gives The Mechanics of Space the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Why do astronauts float inside the International Space Station?
Get it right to open this lesson and 24 more in the app.
How to learn The Mechanics of Space, step by step
Go in order. 25 short levels across 4 sections, about 50 minutes in all, five minutes a day.
- 1
Navigating the Void
- Orbital Motion and Freefall
- Surviving the Space Environment
- 2
Planetary Systems and Dynamics
- Atmospheric Evolution and Habitability
- Rings, Resonances, and Gravity Wells
- 3
Stellar Engines and Extreme Matter
- The Life and Death of Stars
- Relativistic Gravity and Black Holes
- 4
The Expanding Architecture
- Cosmic Expansion and the Early Universe
- The Dark Universe and Cosmic Destiny
4 sections · 8 units · 25 levels. Built to play, not to enroll.
Questions about The Mechanics of Space
How do I learn The Mechanics of Space?
Go in order: start with Navigating the Void, then Planetary Systems and Dynamics, then Stellar Engines and Extreme Matter, then The Expanding Architecture. On Tomo that's 25 short levels, about 50 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for The Mechanics of Space?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. The Mechanics of Space is one of its free courses, and you can type any other topic to get a course of your own.
Is The Mechanics of Space free?
Yes. The Mechanics of Space is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn The Mechanics of Space?
25 levels across 4 sections, about 50 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start The Mechanics of Space?
No. It's pitched at an intermediate level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
The Mechanics of Space is taught in the Professor style: clear, structured, thorough. 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 The Mechanics of Space today.
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