Decoding the Universe
Like Duolingo, but for Decoding the Universe. 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

Key ideas in Decoding the Universe
- Light as a data carrier
- Blue light and temperature
- Stellar signatures in light
- Yellow/White star temperature
- Red light and temperature
- Star color and temperature
- Every chemical element absorbs or emits light at specific, unique wavelengths
- How light acts as a data carrier for distant objects
- A star's spectrum acts as a barcode for its chemical composition
- The relationship between star color and temperature
- Light has a finite speed and takes time to cross cosmic distances
- The image we see of a star is how it looked when the light first left it
- The main job of a telescope is to gather more light than the human eye can (light bucket)
- How specific elements create unique patterns in light
- Collecting more light allows us to see fainter, more distant objects that are otherwise invisible
- The concept of light-travel time as a window into the past
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 Decoding the Universe 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.
If you spot a star glowing with a distinct blue color, what does that tell you about its temperature?
Get it right to open this lesson and 11 more in the app.
Where Decoding the Universe takes you
Learn to read the messages hidden in starlight and understand the invisible forces that shape our cosmos.
- 1
Reading the Cosmic Message
- Starlight as Data
- Gravity: The Universe's Architect
- 2
The Life and Death of Everything
- The Secret Life of Stars
- The Expanding Big Picture
2 sections · 4 units · 12 levels. Built to play, not to enroll.
You pick the voice
Decoding the Universe is taught in the The Bestie style: your friend who just gets it. 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.
More Science on Tomo
The Universe Above Us
Journey from your backyard to the edge of time. Discover how stars are born, why planets stay in orbit, and what lies within the deepest mysteries of the cosmos.
The Secret Life of Cells
Explore the microscopic world within you, where tiny biological machines work tirelessly to keep you alive. Learn how cells build, power, and repair themselves in this comprehensive guide to the building blocks of life.
The Leap to Sixth Grade
Bridge the gap between elementary and middle school by mastering the core systems that connect math, science, and history.
Quantum Physics in Your Pocket
Discover how the strange rules of the subatomic world power your smartphone, heal your body, and define the future of technology.
The Weird World of Quantum Physics
Discover the strange rules that govern the universe at its smallest scale, where objects can be in two places at once and nothing is certain until you look.
Astronomy: Beyond the Telescope
Master the intersection of celestial science, orbital defense, and the cultural mysteries of the cosmos. From the strategic mission of the Space Force to the search for extraterrestrial life and ancient theological views, this course covers the universe's most provocative questions.
Start Decoding the Universe today.
Download Tomo, search Decoding the Universe, and play your first lesson in under a minute.