Gene Roddenberry would have been shocked to see how far the universe reached, and how much of the fictional timeline was written over the years. Whether or not his creation would have liked the new iterations in the franchise, however, he would have been certain about how long it has been running, how many lives it has touched, and how it has even influenced modern day technology.
The universe for Star Trek is both filled to the brink, and fairly sparse depending on what century is being examined. The shows themselves outline the most of the 23rd century with The Original Series and the all new Strange New Worlds, and the 24th century with The Next Generation, Voyager, and Deep Space 9. Discovery, however, is up to the 31st centuries. However, these two periods have yet to be properly outlined.
Discovery has somewhat documented the year 3186 onwards, as well as approximately the 3200s in the Short Trek episode Calypso, revealing a huge time gap between this point and where Picard, the second furthest into the future show, finishes off. While Picard is expected to return for a third season, alongside a plethora of old The Next Generation cast, people are still being fed information about the past century, and the current situation of the Federation and Starfleet. There are
There are several small things that have been identified to be true within this century. Q, the almighty and omniscient trickster pain in the backside, is also predicted that humans will be inhabiting the delta quadrant in this century. It's fortunate that they stumbled upon many shortcuts along the way, even though fans were wrong. Otherwise, the world they would be returning to would have been quite different.
The year 2468, when Jadzia Dax, a symbiont trill from Deep Space 9, predicted the peaceful death of beloved Miles OBrien, surrounded by his friends and family. This is a wonderful image to convey a well-loved character.
Again, the information for this century is sparse, with the most information ironically derived from Enterprise's time travel story elements. Its during this century that the Federation prosperes, becoming a significant force, with the inclusion of the Klingons, Ithenites, and Xindi cultures. Its also during this period when the Temporal Cold War was at its peak. Captain Johnathon Archer:
You've lost me in temporal mode.
The Temporal Cold War, to the words, was a conflict between several time-traveling individuals, each of whom was from different backgrounds in time and space. This was in direct violation of the Temporal Accords, a universal agreement signed in the year 2769, prohibiting its use for historic events.
The 28th and 29th are filled with interesting information. Enterprise reported that in the year 2769, the Federation are using time travel as a standard part of their operations, all in accordance with the temporal agreement established in this century. Its also the time frame in which a probe from the USS Discovery back in the 2250s arrives, where it is upgraded and sent back to gather information.
The Federation time-ships USS Relativity and Aeon are often operating during Voyager in the 29th century, where audiences first saw glimpses of these federation time travel cops who correct misshapen events in the timeline. Most commonly, during Voyager, the Nakuhl, a time traveling participant in the Temporal Cold War, fought the Temporal Accord, and traveled back for this century to the 1940s, where they created an alternate timeline.
As no lot of interest occurs within the 30th century, all these events bring audience back to the 31st century, when little information is available. Daniels is born, a temporal operative who acts as a frequent character within Enterprise, visiting and assist the crew of the Enterprise NX-01, which prevents various temporal incursions that occurred in the Temporal Cold War.
It's interesting to note that although various events have been documented for these centuries, they often connect directly with time travel, and play a significant role in events that are not occurring specifically within the same century. This is mainly due to the show they are referencing this far off future in, rather than the actual one. It's really interesting to see how these additions to Paramount will develop these centuries, boldly not going anywhere they have previously.