Cosmic Timeline • 13.8 Billion YearsPeer-Reviewed Scientific Chronology

Cosmic EvolutionFrom Primordial Plasma to Large-Scale Structure

z = z > 10³¹T > 10³² K

Epoch 1 of 15

Speed:

0 Gyr (Big Bang)t = t ≈ 10⁻⁴³ to 10⁻³⁶ seconds13.8 Gyr (Today)

t ≈ 10⁻⁴³ to 10⁻³⁶ secondsTheoretical Physics Frontier

1. Hot Big Bang Metric Expansion

The Beginning of Spacetime Metric Expansion

Temperature:T > 10³² K

Redshift z:z > 10³¹

Energy Scale:~10¹⁹ GeV (Planck Energy)

Dominant Energy:Quantum Vacuum

Guided Story

The Big Bang wasn't a bomb exploding in the dark. It was the birth of space and time everywhere at once, starting unimaginably hot and dense!

Key Takeaway

The Big Bang happened everywhere simultaneously, creating space and time rather than expanding into prior space.

Primary Scientific References:

Hawking, S.W. & Penrose, R. (1970) — The Singularities of Gravitational Collapse and Cosmology, Proc. R. Soc. Lond. A 314, 529-548

Planck Collaboration (2020) — Planck 2018 results. VI. Cosmological parameters, Astron. Astrophys. 641, A6

Distinguishing simultaneous simulation time-slices from past lightcone observational surveys.

Snapshot 17z = 6

Cosmic Dawn (z=6)

diffuse filamentary web, faint protogalactic mini-halos forming.

Lookback:12.8 Gyr

Void Fraction:35%

Snapshot 33z = 2

Cosmic Noon (z=2)

rapid halo mergers, proto-clusters forming at filament intersections.

Lookback:10.3 Gyr

Void Fraction:58%

Snapshot 50z = 1

Mature Cosmic Web (z=1)

distinct filament spines, pronounced underdense voids.

Lookback:7.8 Gyr

Void Fraction:72%

Snapshot 99z = 0

Present Day (z=0)

rich virialized galaxy clusters (M > 10^15 M_sun), prominent cosmic voids.

Lookback:0 Gyr

Void Fraction:82%

Core Epistemological Principles in Cosmological Visualization:

Expanding Space, Not an Explosion in Space: Metric expansion means space itself expands according to General Relativity, stretching distances between unbound clusters without a physical center or outside boundary.
Limits of Physical Knowledge: We do not assert physical certitude prior to t ≈ 10⁻⁴³ s (Planck time), where classical spacetime breaks down and quantum gravity is required.
Simulation Disclaimers: Cosmological simulations (IllustrisTNG) depict statistical realizations of standard Lambda-CDM physics. They illustrate halo clustering, gas heating, and cosmic web emergence, but do NOT reproduce the actual observed coordinates of real distant galaxies.