26th century

By the 26th century, the first Earth Empire had formed from an Earth-centred alliance of planets. It lasted until the late 30th century. Earth's single, planet-wide government was called EarthGov. (PROSE: Missing Adventures: Home) This century was characterised by tensions which existed between the Earth Empire and other powers including the Empire of the Draconians, the Daleks and the Korven. (TV: Frontier in Space, The Korven)

Events
Earth's Moon was used as a penal colony. (PROSE: Home)

A new race of Cybermen, dubbed "CyberNeomorphs" by the ArcHivist Hegelia, proliferated during this century. (PROSE: Killing Ground)

Early in the century, the Sontarans and the Rutans took their war to Chelsea 426. The Tenth Doctor stopped the Rutans and the Sontarans left before the colony collided with a Great White Spot. The Doctor prevented this as well. (PROSE: The Taking of Chelsea 426)

In 2520, a misunderstanding between human and Draconian ships caused a brief, but highly destructive, war between the empires. A fragile peace was agreed which held for two decades. (TV: Frontier in Space)

By mid-century, much of what had been the southern United States had sunk under the "Mississippi Sea" — probably a much-expanded Caribbean Sea. (PROSE: Home)

In 2540, the Daleks worked with on Operation Divide and Conquer, (AUDIO: The Dalek Conquests) planning to incite a second war between Earth and Draconia to pave the way for a Dalek conquest. The Third Doctor and Jo Grant discovered the plot and managed to alert the humans and Draconians. (TV: Frontier in Space) With the aid of the Time Lords, the Doctor pursued the Gold Dalek to Spiridon. There he and Jo aided a Thal campaign against the Daleks, entombing the 10,000 strong Dalek army being assembled there in ice. (TV: Planet of the Daleks)

The Earth and Draconian Empires united to face the threat of the Daleks, beginning the Second Dalek War, (PROSE: Love and War) though the two empires proved unwilling to cooperate meaningfully in the long term and the war protracted. (COMIC: Star Tigers, AUDIO: Out of Time) Many planets were destroyed in the conflict. The war ended after four decades when the Tenth Doctor and the crew of the Wayfarer destroyed the Dalek ship Exterminator and its Dalek crew, leaving its leader, Dalek X, for dead. With the Dalek Fleet having lost the initiative, (PROSE: Prisoner of the Daleks) the war ultimately "fizzled out". (PROSE: Deceit)

Notable features
Space travel appeared to be significantly faster by the end of the century; the approximately twenty-seven thousand light-year trip from Earth, near the edge of the galaxy, to Dellah, near its core, took about eleven months. (PROSE: Oh No It Isn't!) Space travel could still be lengthy however and it was common to sedate passengers for the longer trips. (PROSE: Biology Lesson on Mal Oreille)

Thanks to genetic engineering, humans no longer had wisdom teeth. (PROSE: Dry Pilgrimage)

Notable individuals
Bernice Summerfield grew up in this century. (PROSE: Just War)

Abslom Daak and the Star Tigers fought Daleks at this time. (COMIC: Abslom Daak... Dalek Killer, Star Tigers)

Ace lived here for three years when she decided to leave the Seventh Doctor and join Spacefleet. (PROSE: Deceit)

Laura Tobin lived in this century as a human before her transformation into the Eighth Doctor's companion Compassion. (PROSE: Interference - Book One, Interference - Book Two)

Space Major Jon Bowman lived in this century. He was in charge of a starship with a crew of bounty hunters during the Second Dalek War, which he helped the Tenth Doctor to end. He and another member of his crew, Koral, survived. The other three died. (PROSE: Prisoner of the Daleks)

Alternate timeline
In a potential history shown by the Eleventh Doctor to Jean-Luc Picard, the Cybermen, having integrated both the Doctor's N-Space and Picard's parallel universe before conquering the Borg, concluded their campaign to convert the galaxy by crushing the last holdout of free humanity on Earth. (COMIC: Assimilation²)