Beyond the Milky Way
Like Duolingo, but for Beyond the Milky Way. 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 Beyond the Milky Way
- Distances in space are too vast for our eyes to perceive depth or 3D scale
- A small nearby object can look the same size as a massive distant one
- Visual size and distance
- The rhythm of a star's pulse is tied to its total light output
- Slower pulses indicate a more powerful, brighter star
- Pulse speed and light output
- Pulse timing reveals how much light the star is actually emitting
- Comparing true brightness to how dim it looks reveals the distance
- The relationship between pulse speed and actual light output
- The process of using a pulsing star to find a galaxy's distance
- Redder light indicates a more significant stretch in the wave
- Light waves stretch because the distance between the source and the observer increases during travel
- A greater stretch in light waves means the object is receding at a higher speed
- The change in color is caused by the motion of the source, not a physical pull on the light itself
- How the degree of color shift indicates relative speed
- The physical mechanism of light waves stretching due to motion
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 Beyond the Milky Way 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 a small galaxy is close to us and a massive galaxy is very far away, how might they look through a telescope?
Get it right to open this lesson and 25 more in the app.
Where Beyond the Milky Way takes you
Move past our local neighborhood to explore the massive structures of the deep universe. Learn to map the cosmic web and understand the invisible forces shaping everything we see.
- 1
Navigating the Deep Sky
- Measuring Distance with Pulsing Stars
- The Redshift: How Light Reveals Speed
- Mapping Our Local Galactic Group
- Identifying Different Galactic Shapes
- 2
The Architecture of the Universe
- When Galaxies Collide and Merge
- The Massive Power of Active Centers
- Superclusters: The Universe's Cities
- The Cosmic Web and Great Voids
- How Gravity Bends Distant Light
- Finding the Edge of the Observable
- 3
The Hidden Drivers of Space
- Dark Matter: The Invisible Glue
- Dark Energy: The Great Expansion
- The Fate of the Expanding Universe
3 sections · 13 units · 26 levels. Built to play, not to enroll.
You pick the voice
Beyond the Milky Way 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 Beyond the Milky Way today.
Download Tomo, search Beyond the Milky Way, and play your first lesson in under a minute.