Trill (planet)

Trill was an inhabited class M planet in the Trill system of 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. (; )
== Astronomical data ==
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 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 5.872 kilograms, giving it a surface gravity of 0.98 g.
The atmosphere of Trill 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 and a mean temperature of 297 Kelvin. ()
==Environment==
Natural features on Trill included forests, lakes, canyons, and caves. Trill's oceans had a purple tint when viewed from space. (; )
Lifeforms native to Trill included the itronok and the ina raptor, as well as birds and flying fish ()
=== Geographical features ===
* Caves of Mak'ala
* Tenaran Ice Cliffs
=== Points of interest ===
* Hoobishan Baths
* Symbiosis Commission
* Trill Science Ministry
* Trill Polytech
====Animals====
*Itronok
*Ina Raptor
== History ==
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. ()
In 2367, the had to contact the Trill homeworld to send a replacement host for an injured ambassador, Odan. ()
In 2371, the traveled to Trill when Jadzia Dax's life was endangered by suppressed memories of her previous host, Joran Belar. ()
In 2375, the 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. ()
Jack Crusher, under his alias "John Carson", was charged with disorderly intoxication on Trill in the late 24th century. ()
In 2402, Deanna Troi and William T. Riker considered taking a beach vacation on Trill. ()
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.
In 3189, the time-displaced traveled to Trill to help Adira Tal access the Tal symbiont's memories. () After the defeat of Emerald Chain, Trill rejoined the United Federation of Planets. ()
==Appendices==
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=== Background information ===
In the series bible for , 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. 
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 , 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 . The planet makes its first appearance in the third season episode . 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 episode , the exterior shots for Trill were filmed at the rock garden in , , . The building, a visitor center for the garden, was designed by CS&P Architects. 
Star Trek: Star Charts (p. 33) and the 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.
=== Apocrypha ===
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 anthology The Lives of Dax, the novel Revenant and the novella Unjoined.
=== External links ===
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Trill
Category:Homeworlds