Era I - Pre-Expansion

• Phase A - From the discovery of the first wormhole to the discovery that Tau Ceti has two.
• Phase B - From Humanity's efforts to colonize a third solar system to its first encounter with alien intelligence.

Era II - Expansion and Society

• Phase A - From first contact to the First Interstellar War.
• Phase B - From the First Interstellar War to encounters with The Watchers.

Era III - The Dream Realized

• Phase A - From the invention of wormhole generators to the Third Interstellar War.
• Phase B - From the invention of artificial gravity to the discoveries at Taboo.

TL 0: primitive
TL 1: medieval
TL 2: Renaissance
TL 3: early Industrial
TL 4: mid-20th century
TL 5: mid-21st century: Era I, Phase A
TL 6: Era IB
TL 7: Era IIA
TL 8: Era IIB
TL 9: Era IIIA
TL 10: Era IIIB