Discipline
Chemistry
Lessons across the journey that lean on chemistry, in the order they appear in the story.
- 2.1 Gravity versus pressureDraft
How a cloud of gas collapses, heats and ignites.
- 2.2 What a star isDraft
Fusion in the core balanced against gravity: the equilibrium that lets a star shine for billions of years.
- 2.3 The lives of stars, sorted by massDraft
Why a star's mass decides everything: how long it lives, how it dies and what it leaves behind.
- 2.5 Reading starlightDraft
Spectra, distances and the cosmic distance ladder: how we measure things we can never visit.
- 2.6 The Sun, a typical starDraft
Our own star as an ordinary star, with Aditya-L1 as India's eye on it.
- 3.1 Where the elements come fromDraft
Stellar nucleosynthesis: how stars build carbon, oxygen and iron.
- 3.2 Making goldDraft
Supernovae and neutron-star mergers, the violent events that make the heaviest elements.
- 3.3 The periodic table as a history bookDraft
Every element has an origin story; the periodic table arranged by where each one was made.
- 3.4 Why carbon?Draft
Bonding, chains and rings: why carbon chemistry is the chemistry of complexity.
- 3.5 Molecules in spaceDraft
Dust, ice and organic molecules between the stars.
- 3.7 Are you really made of stardust?Draft
The famous claim, tested element by element.
- 4.1 From nebula to planetsDraft
How the solar system assembled from a disc of gas and dust.
- 4.5 Oceans and airDraft
Where the water and the atmosphere came from.
- 4.6 Deep timeDraft
Radiometric dating: how we know the age of a rock.
- 5.1 What is life?Draft
Why the most obvious question in biology has no agreed answer.
- 5.2 How chemistry became biologyDraft
The hypotheses and evidence for the origin of life, and why the honest answer is that nobody knows.
- 5.4 The Great Oxidation EventDraft
How life poisoned the planet, and why we breathe the waste.
- 5.5 The complex cellDraft
The merger that happened once and made everything bigger than a bacterium.
- 5.7 Mass extinctionsDraft
Five times the biosphere nearly ended, and what actually did the killing.
- 6.3 Fire, tools and cookingDraft
How an outside stomach paid for an expensive brain.
- 7.2 DomesticationDraft
What we did to plants and animals, and what they did to us.
- 8.2 The Scientific RevolutionDraft
Not a discovery but a method, and not invented anywhere in particular.
- 8.3 Fossil Fuels and IndustryDraft
Digging up three hundred million years of sunlight, and what it did to everyone who did not.
- 8.4 The Great AccelerationDraft
Twenty-four graphs that all bend at the same moment, and what that moment cost.
- 8.5 The AnthropoceneDraft
A proposed geological epoch that was formally rejected in 2024, and why that rejection changes nothing about the evidence.
- 9.2 Energy after fossil fuelsDraft
The transition is probably cheaper than not doing it, and that is the least interesting thing about it.
- 9.3 Machines that learnDraft
Chapter 6 said collective learning made us. This lesson asks, carefully, whether this counts.
- 9.4 Editing lifeDraft
The first CRISPR cure works. It treats a disease concentrated in the places least able to pay for it.