Chapter 1 · the first 380,000 years

Particle Age

The first 380,000 years of cosmic history, in fifteen rewrites. Beginning at the Planck epoch — when all four forces are fused into a single Superforce and the cosmos is 10⁻³⁵ m across — we trace gravity peeling off, inflation hurling space outward, the electroweak split, quarks freezing into protons and neutrons, and the forging of the first light nuclei. The Particle Age ends with recombination: electrons bind to nuclei, the fog lifts, and light streams free for the very first time.

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Fifteen rewrites before t = 1 second

Most of what makes the Universe interesting happens before the Universe is a single second old. In that first second, gravity separates from the other three forces. Space exponentially inflates. Strong and electroweak forces split. Quarks freeze into protons and neutrons. By the time a human heartbeat could have completed, the cosmos has gone through more phase transitions than the rest of its history combined.

The Particle Age — Chapter 1 of Our Cosmic History — is about that astonishing first stretch, from t = 0 at the Big Bang singularity all the way to 380,000 years later, when the cosmos finally cooled enough for light to stream free. Everything we are made of, every force we feel, every ingredient of every star — all of it is set during this window.

10^-40 s10^-30 s10^-20 s10^-10 s10^0 s10^10 sPlanck / GravityInflationEW SplitQuarks Confineν DecoupleNucleosynthesisRecombination
t = 10^-35 s
Exponential Growth
T ≈ 1.0e+28 K
Inflation · Strong Separates
Strong nuclear force splits off. The release of energy drives a sudden exponential expansion — space itself grows by ≥ 10²⁶ in a fraction of a second.
-12.0 → 0.0 ns
Planck1 second380,000 yr
Fig. 1.0.a — The First 380,000 Years. The Particle Age is a fifteen-orders-of-magnitude story compressed into 380,000 years. Click any event to read what's happening; or drag the scrubber to feel the Universe cool.

The Particle Age is over before our species can begin to imagine its own beginning. Everything that came after — every star, every world, every reader of every word — is downstream of these 380,000 years.