Stars, Planets, and the Cosmic Void
Like Duolingo, but for Stars, Planets, and the Cosmic Void. 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 forever · No credit card · iPhone & Android
Key ideas in Stars, Planets, and the Cosmic Void
- The Moon's source of light
- The effect of tidal locking on our view of the Moon
- Half of the Moon is always lit by the Sun regardless of its phase
- Phases change based on how much of that lit half is angled toward Earth
- A Full Moon occurs when the entire sunlit side faces us
- Eclipses only happen when the Sun, Earth, and Moon form a straight line
- A solar eclipse blocks the Sun from our view
- A lunar eclipse involves the Moon falling into Earth's shadow
- The progression of Moon phases based on sunlit perspective
- Distinguishing between solar and lunar eclipse alignments
- The Moon's gravitational pull 'tugs' on Earth's water
- Tides rise and fall as different parts of Earth rotate under the Moon's pull
- The Moon is the primary cause of high and low tides
- The Moon's influence on Earth's oceans
- Moons formed from local debris disks follow stable, circular paths
- Jupiter's massive gravity pulls and squeezes Io's interior
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 Stars, Planets, and the Cosmic Void 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.
How does the Moon's rotation speed compare to the time it takes to complete one orbit around Earth?
Get it right to open this lesson and 76 more in the app.
Where Stars, Planets, and the Cosmic Void takes you
Journey from the familiar glow of our Moon to the crushing gravity of black holes. Master the life cycles of stars and discover the strange worlds orbiting distant suns.
- 1
Our Local Wonders
- The Moon and its Secrets
- Moons of the Solar System
- 2
The Secret Life of Stars
- Stellar Nurseries
- The Main Sequence
- Stellar Classification
- 3
The End of the Road
- Red Giants and White Dwarfs
- Supernovae: The Great Explosion
- Neutron Stars and Pulsars
- 4
The Gravity Extremes
- Black Holes: The Point of No Return
- Time and Space Near a Black Hole
- White Holes and Wormholes
- 5
Worlds Beyond Our Sun
- Hunting for Exoplanets
- Strange New Worlds
- The Search for Life
- 6
Visitors from the Deep
- Comets: The Dirty Snowballs
- Asteroids and Meteors
- 7
Reading the Night Sky
- Constellations and Navigation
- Measuring the Universe
- 8
The Big Picture
- The Milky Way and Beyond
- Dark Matter and Dark Energy
8 sections · 20 units · 77 levels. Built to play, not to enroll.
You pick the voice
Stars, Planets, and the Cosmic Void is taught in the 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.
More Science on Tomo
The Mechanics of the Cosmos
Master the mathematical laws and physical principles that govern everything from the motion of planets to the quantum behavior of starlight.
Bones, Muscles, and Movement
Go beyond naming parts to understand how the human frame generates power, maintains stability, and adapts to the physical world.
The Physics of the Void
Understand the invisible rules that govern the cosmos, from why satellites don't fall to how gravity bends the very fabric of time.
Human Anatomy and Physiology
Go beyond basic diagrams to master the complex mechanical and chemical interactions that sustain human life. This course bridges the gap between structural form and clinical function for a professional-grade understanding of the body.
Atmospheric Physics: The Secret Life of Clouds
Move beyond basic classification into the complex thermodynamics and microphysics that drive cloud formation and global climate regulation.
Stargazing and the Hidden Universe
Learn to read the night sky like a map and discover the secret messages hidden in starlight. From finding famous constellations to 'seeing' invisible radiation, you'll view the cosmos in a whole new light.
Start Stars, Planets, and the Cosmic Void today.
Download Tomo, search Stars, Planets, and the Cosmic Void, and play your first lesson in under a minute.