The Expanse

1. ·Save for only one, no certain chronological parameter has ever been affirmed within the series. The only known certain date is 2307, the commencement production date of Ganymede Gin , a liquor brand.
2. ·Although still not one-hundred-percent confirmed, the year 2350 corresponds to 8 XTE.
3. Interplanetary era
4. > 2,000,000,000 BXTTime period approximated based on extrapolation...
5. > 2,000,000,000 BXTThe Ring Builders evolve on their homeworld, likely somewhere in the Milky Way galaxy.
6. > 2,000,000,000 BXTThe Ring Builders achieve spaceflight.
7. circa 2,000,000,000 BXTThe Ring Builders uncover wormhole physics. Subsequently, they commence building a massive interstellar network spanning across many star systems in the Milky Way.
8. circa 2,000,000,000 BXTThe Ring Builders' empire becomes the dominant power in their small corner of the galaxy. The species thrives.
9. circa 2,000,000,000 BXTAround this time, the Ring Builders place the protomolecule in Phoebe , and send Phoebe on a trajectory towards the prehistorical, primitive Earth .
10. circa 2,000,000,000 BXTPhoebe is caught by Saturn 's gravity, sparing Earth's primitive life from the protomolecule.
11. circa 200,000 BXTThe modern human evolves on Earth.
12. circa 200,000 BXTHumanity migrates beyond Africa.
13. 9,000 BXTThe very first human settlements are built.
14. 500 - 350 BXTThe two global conflicts are ignited between human alliances. About one hundred million people are killed.
15. 500 - 350 BXTThe United Nations is formed, but has extremely limited powers that have very little effect on most nations states.
16. 500 - 350 BXTThe United States and the Soviet Union emerge as the two superpowers. The Cold War begins.
17. 500 - 350 BXTThe Soviet Union starts the era of human spaceflight, soon followed by the United States.
18. 500 - 350 BXTThe United States lands the first human on the moon (Luna), humanity's first steps on another planetary body.
19. 500 - 350 BXTEventually, the USSR dissolves, leaving the United States as the sole superpower for decades to come.
20. circa 290 BXTFirst permanent settlement on Mars .
21. 300 - 200 BXTThe damage done to Earth's ecosystem reaches critical levels.
22. 300 - 200 BXTThe various nations on Earth focus their economies on the advancement of space travel.
23. 300 - 200 BXTEventually, the United Nations becomes the unified government of humanity.
24. 200 - 130 BXTMars pleads for independence from the United Nations. The UN refuses.
25. 200 - 130 BXTTensions grow between the UN and its colony.
26. 129 BXTSolomon Epstein achieves a breakthrough regarding space propulsion and develops the Epstein Drive .
27. 128 BXTMars exchanges the Epstein drive for independence from the UN.
28. 128 BXTThe Martian Congressional Republic is proclaimed.
29. 127 - 50 BXTThe United Nations and the MCR, both using the Epstein drive, colonize the remaining outer part of the Sol system.
30. 127 - 50 BXTGanymede becomes the breadbasket of the outer planets.
31. 127 - 50 BXTSignificant anatomical differences develop between Inners and Belters , due to growth in low gravity. Such differences also exist between Earthers and Martians , but are not as obvious.
32. c. 90 BXTThe Weeping Somnambulist is constructed.
33. 70 BXTBirth of Santichai Supitayaporn and Melissa Supitayaporn on Earth.
34. 30 BXTThe OPA (Outer Planets Alliance) is founded.
35. 12 BXTAmos Burton departs Earth.
36. 4 BXTJames Holden joins the United Nations Navy .
37. 3 BXTChrisjen Avasarala becomes the Deputy Undersecretary of Executive Administration of the UN.
38. 1 XTEThe MCR surveys Phoebe and discovers the protomolecule.
39. 1 XTEThe Martian government approaches Protogen as a co-sponsor of a long-term facility to investigate the protomolecule.
40. 2 XTESantichai and Melissa Supitayaporn move to Ganymede.
41. 3 XTEJames Holden is dishonourably discharged from the UNN. Subsequently, Holden is contracted by the Pur'n'Kleen Water Company .
42. 8 XTEJulie Mao boards the Scopuli . Eventually, she ends up on Eros , where she dies of protomolecule exposure.
43. 8 XTEThe Canterbury is destroyed by Protogen forces, but some escape on the Knight shuttle.
44. 8 XTEThe Donnager is destroyed by Protogen forces, but some escape on the Tachi (frigate housed in the Donnager ).
45. 8 XTEThe Tachi is renamed the Rocinante by her new crew and docks at Tycho Station for repairs and a new transponder to make the transition complete.
46. 9 XTEJulie Mao's body is found by Miller , Holden, and his crew.
47. Eros incidentThe protomolecule is let loose on Eros station, killing all of its inhabitants. Only Miller and Holden manage to escape and return to the Rocinante .
48. More detail of events from 9 XTE onwardClick XTE-<Era name> (i.e. XTE-Alpha) below to expand...
49. Notes
50. ·Where these roughly correspond to the relative timeline for comparison and contrast purposes between book and television incarnations even when events themselves might not correspond identically in both timelines.
51. References
52. ·↑ Caliban's War , page 59. "The Somnambulist was nearly a hundred years old and definitely at the end of her life cycle."
53. ↑ Caliban's War , page 114↑ roughly the "Year" within the era
54. ↑ Caliban's War , page 114↑ estimated to a specific year, month, day, hour
55. ↑ Caliban's War , page 114↑ Extra-solar Technology (Protomolecule) Era Year
56. ↑ Caliban's War , page 114↑ Development of the Rocinante
57. ↑ Caliban's War , page 114↑ Expanse Preview Gameplay 0:07
58. ↑ Caliban's War , page 114↑ Sound track released on Vinal was made of 2254 copies to signifiy the date. This is presumably a mistake and was meant to be 2354. This soundtrack was released after season 4 aired indicating this to be the date during this season
59. ↑ Caliban's War , page 114↑ Stated as four years prior to the Pallas colony revolt which was stated as 10 years prior to current events in LW.
60. ↑ The Expanse Novel (9) Leviathan FallsEpilogue: The Linguist

Source: Timeline and chronology

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