The Beginning of the Universe
Trace the cosmos back to its very first moments using the clues hidden in today's night sky. Discover how expanding space, ancient starlight, and cosmic static reveal the origin of time, matter, and everything we see.
Like Duolingo, but for The Beginning of the Universe. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through Finding Clues in the Modern Sky and Reconstructing the First Moments. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in The Beginning of the Universe
- Light does not travel instantly; it moves at a fast but finite speed
- A light-year is the distance light travels in one Earth year
- Seeing light that has traveled across space means seeing what the source looked like when that light first left it
- Every celestial object we see is seen with a delay proportional to its distance
- Nearby solar system objects show us moments ago, nearby stars show us years ago, and other galaxies show us millions or billions of years ago
- The night sky is not a single snapshot in time, but a patchwork of different historical eras
- In an infinitely old, unchanging universe with stars everywhere, starlight would have had time to reach us from every direction, filling the whole sky with blinding light
- The sky is dark at night because the universe has a finite age; light from the farthest stars simply hasn't had enough time to reach Earth since the beginning
- The darkness of the night sky is evidence that the universe had a start in time rather than existing forever
- Peering into the most distant reaches of space catches ancient light emitted shortly after the universe began
- Space telescopes capture images of infant galaxies as they were when the universe was in its earliest stages
- Telescopes act as optical time machines by receiving ancient light, not by physically moving matter backward through time
- Light waves stretch to longer, redder wavelengths when the object emitting them is moving away from the viewer
- Nearly every distant galaxy in the universe shows this redshifted light, indicating they are all receding from us
- Cosmic expansion means space itself is stretching between galaxies, carrying them farther apart
- Galaxies are not simply rocketing through fixed, empty space; the fabric of space is growing between them like marks on an expanding balloon
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 Beginning of 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.
You look at a star that sits 500 light-years away. What are you seeing?
Get it right to open this lesson and 10 more in the app.
Where The Beginning of the Universe takes you
- 1
Finding Clues in the Modern Sky
- Looking Back in Time with Starlight
- Rewinding the Cosmic Expansion
- 2
Reconstructing the First Moments
- The Afterglow of the First Light
- Forging the First Matter
2 sections · 4 units · 11 levels. Built to play, not to enroll.
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 Beginning of the Universe 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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Explore your anatomy as a vast, living ecosystem where cells are citizens, blood is a transit system, and light sets the planetary clock.
Start The Beginning of the Universe today.
Download Tomo, search The Beginning of the Universe, and play your first lesson in under a minute.