Episode 1.1 · 20 min

The Big Bang

How expansion and cooling transformed the early universe from a hot plasma into a transparent cosmos of atoms—and what its oldest light can tell us.

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Visual credits

15 sources

Sources and credits for imagery used in this film, including material incorporated into explanatory animations.

  • The Cosmic Microwave Background: temperature and polarisation

    ESA

  • Bontecou Lake Milky Way panorama

    Juliancolton

  • Inflation constraints in the scalar-index and tensor-to-scalar-ratio plane — Figure 1

    L. Balkenhol, E. Camphuis, F. Finelli, K. Benabed, F. R. Bouchet, J. Carron, S. Galli, E. Hivon, A. R. Khalife, L. Knox, C. L. Reichardt, A. Vitrier, W. L. K. Wu

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Map

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific image

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • View of the LHCb experiment in its underground cavern (image: CERN)

    CERN

  • Charge–parity symmetry breaking in baryon decays — Figure 1, decay illustration and diagrams

    LHCb Collaboration

  • Charge–parity symmetry breaking in baryon decays — Figure 2, mass distributions

    LHCb Collaboration

  • Scientific figure · source page 6

    Kislitsyn et al.

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Primordial helium abundance — Figure 20, helium versus oxygen abundance regression

    Erik Aver, Evan D. Skillman, Richard W. Pogge, Noah S. J. Rogers, Miqaela K. Weller, Keith A. Olive, Danielle A. Berg, John J. Salzer, John H. Miller Jr., José Eduardo Méndez-Delgado

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 4

    Particle Data Group

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific image

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Image of Act telescope

    ACT Collaboration

  • image acttemp

    ACT Collaboration

  • hep cosmology astrophysics 0 image

    Argonne National Laboratory

Animation design references 1 sources

These works informed the design of explanatory animations. A reference listed here is not necessarily reproduced on screen.

  • Scientific figure · source page 6

    Figure or page excerpt cropped from the source publication.

Research references

Selected sources from the episode’s research and scientific figures.

  1. PDG 2026 reviews index ↗
  2. Balkenhol et al. 2026, arXiv:2512.10613v2 ↗
  3. LHCb, Nature 643 (2025) ↗
  4. LBT helium, arXiv:2601.22238 ↗
  5. LBT cosmological implications, arXiv:2601.22239 ↗
  6. BBN sensitivity atlas, arXiv:2603.22414v2 ↗
  7. Data-driven D/H prediction, arXiv:2604.16600 ↗
  8. Planck 2018 cosmological parameters ↗
  9. ACT DR6 maps, arXiv:2503.14451 ↗
  10. SPT-3G D1 v2 ↗
  11. https://lambda.gsfc.nasa.gov/product/cobe/firas_monopole_spect.html ↗
  12. https://www.esa.int/ESA_Multimedia/Images/2018/07/Planck_s_view_of_the_cosmic_microwave_background2 ↗
  13. https://act.princeton.edu/overview/act-dr6-science ↗
  14. PDG 2025 BBN review ↗
  15. J1332+0052 deuterium, arXiv:2401.12797 ↗
  16. PDG 2026 Big-Bang Cosmology ↗
  17. NASA John Mather Big Bang Q&A ↗
  18. NASA expansion explainer ↗
  19. ESO molecular CMB thermometer ↗
  20. SH0ES SMC anchor, arXiv:2404.08038 ↗
  21. DES supernova time dilation, arXiv:2406.05050 ↗
  22. Planck 2018 inflation constraints ↗
  23. BICEP/Keck + Planck PR4 ↗
  24. Simons Observatory expanded SAT forecast, arXiv:2512.15833 ↗
  25. Simons Observatory first-light site ↗
  26. PDG 2026 Big-Bang Nucleosynthesis ↗
  27. PDG 2026 Cosmic Microwave Background ↗
  28. CERN result page ↗
  29. arXiv:2509.16103 ↗
  30. RMP baryogenesis review ↗
  31. Miranda lithium model, arXiv:2508.09821 ↗
  32. NASA LAMBDA FIRAS products ↗
  33. ESA Planck CMB explainer ↗
  34. Duration of last scattering ↗
  35. https://esdcdoi.esac.esa.int/doi/html/data/astronomy/planck/CMB_Maps.html ↗
  36. https://lambda.gsfc.nasa.gov/product/wmap/current/ ↗

Music

  • Meditation From The Star Orion
    OctahedronMusic · Envato Elements
Footage and image usage

Credits and usage times retained from the published edition or its production credit record. Where present, times identify visual appearances, not documentary chapters. Source and licence corrections are listed in the visual credits above.

  • ESA - 0:40-0:43, image
  • ACT Collaboration - 17:55-18:01, act dr6 science image; 18:01-18:06, act dr6 science image
  • Argonne National Laboratory - 18:06-18:14, hep cosmology astrophysics 0 image
  • CERN - 8:47-8:55, image
  • Juliancolton - 1:24-1:38, Bontecou Lake Milky Way panorama
  • Springer Nature - 8:55-9:04, image; 9:04-9:13, image
  • Custom animations and figures: From Cosmos to Civilization. Third-party material incorporated into animations is credited on the linked sources page.

How this film was made

Created and editorially directed by Anders Lunde using a custom production system developed over six months. AI assists research, drafting, programming, and visual production; I review and edit the material and make the final editorial decisions. Narration uses text-to-speech. Visuals combine custom-built scientific animations, AI-generated reconstructions, and credited scientific imagery.

Generated reconstructions illustrate scientific interpretations. They are distinct from photographs, specimens, and measured data.

More about the creator and production →