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Trillius Prime, often shortened to Trill, was an inhabited class M planet, the prime planet in the Trill system, located in the Alpha Quadrant. It had a single moon. This was the homeworld of two sentient species who shared a symbiotic relationship: the Trill, a warp-capable humanoid species, and the non-humanoid Trill symbionts. The planet was governed by the Trillian government, which enforced Trill law. Mak'ala was the capital city. (DS9: "Invasive Procedures", "Equilibrium"; DIS: "Forget Me Not")

Astronomical data

Planetary data for Trill

Planetary data for Trill

Trill orbited its sun at a distance of 1.215 AU, with an orbital period of 483 solar days and a Keplerian ratio of 0.967. Its rotation period was 26.6 hours long. The planet had a radius of 6,493 kilometers and a surface area of five hundred million square kilometers. The estimated age of the planet was 4.682 billion years. Its mass was estimated to be 5.872e24×1024 kilograms, giving it a surface gravity of 0.98 g.

The planet's atmosphere was composed of 76% molecular nitrogen, 21% molecular oxygen, 0.8% argon, 0.5% water vapor, and 0.3% carbon dioxide, with trace amounts of methane. The surface had an atmospheric pressure of 1.012 bar and a mean temperature of 297 Kelvin. (DIS: "Jinaal")

Environment

Forest near the Caves of Mak'ala (3189)

Forest near the Caves of Mak'ala (3189)

Natural features on Trillius Prime included forests, lakes, canyons, and caves. The planet's oceans had a purple tint when viewed from space. (DS9: "Past Tense, Part I", "Equilibrium"; DIS: "Forget Me Not", "Jinaal")

Lifeforms native to Trillius Prime included the itronok and the ina raptor, as well as birds and flying fish. (DIS: "Forget Me Not", "Jinaal")

Geographical features

Points of interest

Animals

History

Trill in 2371

Trill in 2371

The symbionts' ancestral home was in the underground caves, including the Caves of Mak'ala. The Trill had information on joinings as far back as the 12th century. (DIS: "Forget Me Not")

Trillius Prime was one of the regular destinations of the Earth Cargo Service ships in the 22nd century. Travis Mayweather visited this planet in the sixth grade. It took three years for the ECS Horizon to get there. (ENT: "Broken Bow")

Travis Mayweather was born in 2126 (ENT: "Broken Bow", "Fortunate Son") and was fifteen in 2141 (ENT: "Bound"). Assuming that the education system of the 22nd Century is largely the same as the 21st Century, and a sixth grader is normally eleven years old, he would have visited this planet in 2137.

In 2367, the USS Enterprise-D had to contact the Trill homeworld to send a replacement host for an injured ambassador, Odan. (TNG: "The Host")

In 2371, the USS Defiant traveled to Trill when Jadzia Dax's life was endangered by suppressed memories of her previous host, Joran Belar. (DS9: "Equilibrium")

In 2375, the USS Destiny was en route to Trill with the Dax symbiont, which had been injured, when the symbiont took a turn for the worse. As a result, it had to be joined with Ezri Tigan, the only Trill on the Destiny. (DS9: "Shadows and Symbols")

Jack Crusher, under his alias "John Carson", was charged with disorderly intoxication on Trill in the late 24th century. (PIC: "Disengage")

Advertisement for a beach on Trill

Advertisement for a beach on Trill

In 2402, Deanna Troi and William T. Riker considered taking a beach vacation on Trill. (PIC: "The Last Generation")

In 3069, The Burn decimated the Trill population, resulting in the planet becoming more insular in an attempt to stave off extinction. Despite this, a century later there were still not enough viable hosts for the remaining symbionts. Trill was among the Federation members that chose to secede during this period.

It is unclear when the Trill first became a member of the Federation; its status in the 24th century is ambiguous.

In 3189, the time-displaced USS Discovery traveled to Trill to help Adira Tal access the Tal symbiont's memories. (DIS: "Forget Me Not") After the defeat of the Emerald Chain, Trill rejoined the United Federation of Planets. (DIS: "That Hope Is You, Part 2")

In the 32nd century, Trill was a Federation member. It was listed with other members on a video wall in the USS Athena. (SA: "Kids These Days")

When the Venari Ral laid Omega-47 mines around the core of Federation space in 3196, this planet was within the blast radius of one of the mines. (SA: "300th Night", "Rubincon")

Stellar cartography

In 3196, during the Omega-47 crisis, the location of Trill (Trillius Prime) was depicted on star charts and readouts used across several locations on the USS Athena to locate, monitor, and respond to the Omega-47 mines laid by the Venari Ral. (SA: "300th Night", "Rubincon")

In "Two Days and Two Nights", the Enterprise - an NX-class starship - became the first Earth ship to travel 90 light years from its homeworld. Trillius Prime was visited by Humans prior to this event, and thus must be closer.
According to "Horizon", the top speed of the ECS Horizon was warp 2, which corresponded to 8 times the speed of light according to the warp chart seen in "First Flight". This suggests that Trillius Prime was located about 24 light years away from Earth.

Appendices

Appearances

References

Background information

In the series bible for Star Trek: Deep Space Nine, it was said that the underground of Trill and the planet's surface were where the Trill symbionts and humanoids lived, respectively. It was also stated that "an environmental disaster" led the two species to begin integrating with each other. [1]

As there were two make-up configurations designed for the Trill, Jadzia Dax actress Terry Farrell once suggested that "the north of Trill" was the birthplace of the simpler-looking Trill whereas the planet's south was where the more elaborate physical design, involving spots, originated. (Cinefantastique, Vol. 23, No. 6, p. 21) While filming DS9 Season 1 finale "In the Hands of the Prophets", Farrell also expressed hopes of seeing Trill in the second season of Star Trek: Deep Space Nine, saying, "I'd like to go to the planet where I'm from." (Cinefantastique, Vol. 24, Nos. 3/4, p. 98.)

The name of the Trill homeworld was first established as "Trill" in the second season outing "Invasive Procedures". The planet makes its first appearance in the third season episode "Equilibrium". Portraying the planet in that episode proved highly expensive. Some of the Trill exteriors shown in "Equilibrium" were filmed on location in Huntington Gardens. "I think there were a lot of interesting things about the Trill homeworld that you found out in the episode," commented René Echevarria, who wrote "Equilibrium"'s script. (Captains' Logs Supplemental - The Unauthorized Guide to the New Trek Voyages, pp. 84 & 85.)

For the Star Trek: Discovery episode "Forget Me Not", the exterior shots for Trill were filmed at the Royal Botanical Gardens rock garden in Hamilton, Ontario, Canada. The building, a visitor center for the garden, was designed by CS&P Architects. [2]

Star Trek: Star Charts (p. 33) and the Star Trek Encyclopedia, 4th ed., vol. 2, p. 421 identified the Trill homeworld as Trillius Prime and that it was governed by the Trill Symbiosis, admitted into the Federation in 2285. As of 2370, the planet was populated by 650 million Trill and 11 million symbionts, though the existence of symbionts was not widely known prior to 2367. This connection was confirmed in official media on star charts seen in "300th Night".

According to StarTrek.com, Trillius Prime was located in the Alpha Quadrant. [3](X)

Apocrypha

Worlds of Star Trek: Deep Space Nine, Volume Two focuses on Trill and Bajor.

Worlds of Star Trek: Deep Space Nine, Volume Two focuses on Trill and Bajor.

The Star Trek: Federation Travel Guide calls out local attractions including the Teneran Ice Cliffs (3/3 stars) in the southern hemisphere and the caves of Mak'ala (2/3 stars.) "The Interplanetary Bar and Grill" serving foods from hundreds of worlds is highlighted, noting "local cuisine failed to tempt our reviewers palate." The Selipsis is identified as Trill's largest and oldest beach resort. "Grow old in wisdom" is noted as a local key phrase to know.

Trill is depicted in several of the short stories in the novel anthology The Lives of Dax, the novel Revenant and the novella Unjoined.

External links