ScienceThe BestieIntermediate
The Search for Extraterrestrial Life, a free science course on Tomo

The Search for Extraterrestrial Life

Like Duolingo, but for The Search for Extraterrestrial Life. 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.

A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through Detecting the Invisible and The Great Silence and Contact. It assumes you already know the basics.

12 bite-size levelsAbout 5 minutes each

Free forever · No credit card · iPhone & Android

Cosmo the Comet, the guide who teaches the The Search for Extraterrestrial Life course
The Search for Extraterrestrial Life
with Cosmo the Comet
12
Levels
2
Sections
5
Min/day
What you'll learn

Key ideas in The Search for Extraterrestrial Life

  • Gases in an alien atmosphere absorb specific wavelengths of starlight
  • Oxygen and methane react and disappear unless life constantly replenishes them
  • The resulting absorption spectrum acts as a chemical fingerprint for life
  • Chemical disequilibrium shows a planet's chemistry is being actively driven by biology
  • Chlorophyll-like pigments reflect infrared light to avoid overheating
  • Natural objects emit radio waves across a wide range of frequencies
  • The Red Edge creates a distinct contrast between visible and infrared light
  • Intentional alien broadcasts concentrate energy into a very narrow frequency
  • Distinguishing artificial technosignatures from natural cosmic radio sources
  • Carbon can form the complex, stable chains needed for alien genetic coding
  • Identifying the specific light-reflection pattern of alien plant life
  • Water remains liquid over a wide temperature range, acting as a universal solvent
  • The chemical justification for prioritizing carbon-based life searches
  • Gravitational tugging from a host planet creates internal friction
  • A planetary dynamo creates a magnetosphere that deflects radiation
  • Tidal heating generates enough warmth to melt subsurface ice
Why not just Google it

You've tried the other tabs

Wikipedia

Thirty open tabs. Four facts you actually kept.

YouTube

You watched. You nodded. By Sunday it was gone.

ChatGPT

One answer, then back to scrolling.

Online courses

Eight weeks. You meant to finish. You didn't.

Tomo gives The Search for Extraterrestrial Life 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.

Try a question

Here's what playing it feels like

A real question from this course. Take your best guess.

Reading the Light of Distant Worlds

Imagine a telescope watching a planet pass in front of its star. How do we know what's in that planet's atmosphere?

Get it right to open this lesson and 11 more in the app.

Course map

Where The Search for Extraterrestrial Life takes you

Move beyond science fiction to explore the rigorous science of astrobiology, from detecting chemical fingerprints in distant atmospheres to the protocols of first contact.

  1. 1

    Detecting the Invisible

    • Hunting for Biosignatures
    • Habitability Beyond the Goldilocks Zone
  2. 2

    The Great Silence and Contact

    • Navigating the Fermi Paradox
    • Protocols for First Contact

2 sections · 4 units · 12 levels. Built to play, not to enroll.

How it's taught

You pick the voice

This course
The Bestie

The Search for Extraterrestrial Life 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.

Keep going

More Science on Tomo

Astronomy: Beyond the Telescope course icon

Astronomy: Beyond the Telescope

Bestie

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.

95 levels3h 10mIntermediate
Ocean Worlds: Life on Saturn's Moons course icon

Ocean Worlds: Life on Saturn's Moons

Professor

Explore the icy frontiers of Enceladus and Titan to uncover the chemical secrets of subsurface oceans and the potential for extraterrestrial life.

87 levels2h 54mIntermediate
Ocean Worlds of the Solar System course icon

Ocean Worlds of the Solar System

Explain Like I'm 5

Journey beyond Earth to discover the hidden, liquid-water oceans locked beneath the icy shells of moons and dwarf planets. Explore the chemistry, gravity, and extreme environments that make these distant worlds the best places to search for alien life.

70 levels2h 20mBeginner
Cosmic Navigator: Beyond the Basics course icon

Cosmic Navigator: Beyond the Basics

Storyteller

Move beyond naming planets and start understanding the mechanics of the universe. Learn to track orbital dances, decode the life cycles of stars, and navigate the invisible forces that shape our galaxy.

180 levels6hIntermediate
Stars, Planets, and the Cosmic Void course icon

Stars, Planets, and the Cosmic Void

Professor

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.

77 levels2h 34mBeginner
Exoplanets and the Search for Life course icon

Exoplanets and the Search for Life

Professor

An exhaustive exploration of planetary systems beyond our own, from the subsurface oceans of icy moons to the detection of biosignatures in the deep cosmos.

71 levels2h 22mAdvanced
Start free

Start The Search for Extraterrestrial Life today.

Download Tomo, search The Search for Extraterrestrial Life, and play your first lesson in under a minute.