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Multiple realities
(covers information from several alternate timelines)

Earth from orbit

Class: M
Type: Planet
Satellites: Luna
Native Species: Human
Humpback whale
Location: Sol system
Sector 001
Alpha Quadrant
Affiliation: United Earth
Coalition of Planets
United Federation of Planets

The surface of Earth

"Earth? Never heard of it."
- various species encountered by the crew of Enterprise (NX-01)

Earth (or Sol III or Terra) was the inhabited third planet of the Sol system. It was a M-class planet and had a single natural satellite, Luna. Earth was the homeworld of the Humans and the Voth, amongst others, and was the capital planet of the United Federation of Planets.

In 2150, with the last nation-states joining, the planet was unified under the United Earth government. It was a founding member of the Coalition of Planets in 2155, and of the United Federation of Planets in 2161. The President's office, the Federation Council, as well as Starfleet Headquarters and the main branch of Starfleet Academy were located on Earth. During the Dominion War, Earth's strategic importance was on par with worlds like Andor, Berengaria VII, and Vulcan. (Star Trek: The Motion Picture, Star Trek IV: The Voyage Home, Star Trek VI: The Undiscovered Country, TNG: "Conspiracy", "The Best of Both Worlds", DS9: "Homefront", "Paradise Lost", "In the Cards", VOY: "In the Flesh", ENT: "Broken Bow", "Zero Hour", "Home")

Planetary Data

Earth was a spheroid-shaped planet with a circumference of 24,874 miles (40,075 kilometers), a mass of 5.8e24×1024 kilograms and a mean density of 5.517. Its atmosphere had an average temperature of 75 °F (24 ºC) and consisted of 78% nitrogen, 21% oxygen as well as smaller percentages of krypton, neon, and argon. (TOS: "Miri", "Metamorphosis", "Bread and Circuses")

Astronomical data


Earth map

A map of Earth in the 24th century

The location and orbit of Earth inside the Sol system was depicted on several ancient and modern planetary system charts (Star Trek: Enterprise opening titles; TOS: "The Cage", "The Changeling") and the location of the Sol system in relation to other stars in the galaxy was depicted on several star charts. (Star Trek II: The Wrath of Khan; Star Trek VI: The Undiscovered Country; TNG: "Conspiracy")

According to the Star Trek Encyclopedia, Earth marked the border between Alpha and Beta Quadrants. The display graphic on a PADD in Star Trek: Insurrection would seem to confirm this. [1] [2] Dialogue in Star Trek: Voyager and Star Trek: Deep Space Nine however firmly establish that Earth was located on the Alpha Quadrant side of the border. The production artist and designer Geoffrey Mandel wrote, "...while the Sol system is divided equally between the Alpha and Beta Quadrants, it is considered to be a part of the Alpha Quadrant." (This quote was from page 19 of Mandel's book, Star Trek: Star Charts.)


See also: Human history, Federation history, List of Earth conflicts

Earth as it appeared about 3.5 billion years ago

The first life was formed on Earth from a group of amino acids that combined to form the first proteins approximately 3.5 billion years ago. From this humble start, at least three known corporeal sentient species evolved on Earth, Human, Voth, and Humpback whales. The first two species shared the basic humanoid appearance, which may be the result of the genetic seeding that occurred long ago by the first sentient species to inhabit the galaxy. Tens of millions of years prior to the development of modern man, the Voth society abandoned the Earth, thrusting itself towards the stars, leaving no apparent trace on Earth of the civilization that existed. (Star Trek IV: The Voyage Home; TNG: "The Chase", "All Good Things..."; VOY: "Distant Origin")

According to actual science, life already gained a foothold on Earth 4.1 billion years ago. However, this wasn't theorized until after the shooting of "All Good Things...".

Earth had been the birthplace of several major religions, such as Buddhism, Christianity, Hinduism, and Judaism. Some of these religions, in one form or the other, have survived to the 23rd and 24th century. (TOS: "Balance of Terror", DS9: "Penumbra", VOY: "The Killing Game")

In the 17th century, the scientist Galileo Galilei taught the masses that the Earth moved around the sun. For these teachings, he was tried and convicted of heresy by an inquisition, and his books were burned. (DS9: "In the Hands of the Prophets")

Earth has also been visited, observed, and occasionally manipulated during its history, prior to official First Contact by the Vulcans. One of the earliest extraterrestrial visits was by a race known as the Sky Spirits, originally native to the Delta Quadrant. These also included an ancient humanoid species, the Preservers, descendants of Humans abducted around 4000 BC, and Vulcans themselves, although there is still dispute about this as there was no proof or evidence offered by the Vulcan High Command. The Humpback whales were being observed by an unknown entity, who upon loss of contact with the species, sent a probe to investigate the absence of whale song. In the 19th century, a race called the Skagarans abducted several thousand Humans from the American west and then used them as slave labor. The El-Aurian Guinan also stayed discreetly on Earth. In the 1930s the Briori visited Earth and abducted several individuals including famous pilot Amelia Earhart. In the 1950s a team of Vulcan explorers were temporarily stranded on Earth. (TOS: "Assignment: Earth", "The Paradise Syndrome"; Star Trek IV: The Voyage Home; TNG: "The Chase"; TNG: "Time's Arrow"; ENT: "Carbon Creek"; VOY: "The 37's"; VOY: "Tattoo")

From the mid-20th century onwards, manned and unmanned spacecraft have been launched from either the surface or the orbit of Earth. Several prominent craft that have been launched from Earth include Apollo 11, Nomad, Phoenix, Friendship 1, Enterprise, and the USS Enterprise, (TOS: "The Cage", "Where No Man Has Gone Before", "The Changeling"; Star Trek: First Contact; VOY: "Friendship One"} Starting in the 22nd century and continuing on into the 24th, there was major construction projects on the surface and in the orbit of Earth that supported the burgeoning expansion of Humans into space. Some of these projects were the Warp Five Complex, the San Francisco Fleet Yards, Spacedock, and Earth Station McKinley. (ENT: "Broken Bow"; TOS: "Where No Man Has Gone Before"; Star Trek III: The Search for Spock; TNG: "Family")

In 2063, with the successful flight of the Phoenix, Earth became warp capable. (Star Trek: First Contact)

Star Trek: The Next Generation Technical Manual stipulated that at least two other species of marine mammals (Pacific bottlenose dolphins and Takaya's whales) served on board Template:ShipClass class starships as either crew or civilian navigation consultants. This was supported in canon by a hatchway label, seen in "We'll Always Have Paris", that read, Tursiops Crew Facility.

Attacks on Earth

During its long history, the existence of the planet had been threatened by both natural disasters and actions of alien intelligences.

  • In 2286, a alien probe of unknown origin wreaked ecological havoc while trying to contact an extinct species of Humpback whale by transmitting massive amounts of energy into Earth's oceans and unintentionally caused them to begin evaporating. The threat was ended when the former crew of the USS Enterprise, having used a stolen Klingon Bird-of-Prey to travel back in time to before the species' extinction, returned to the present with two Humpbacks, and after the two whales gave a response to the probe, it departed the Solar System with little, if any, real harm done to the planet. (Star Trek IV: The Voyage Home)
  • In 2375, the Borg decided to create another strategy, since all direct assaults on Earth had failed thus far. They planned to detonate a biogenic charge in Earth's atmosphere, infecting all lifeforms with nanoprobe viruses, triggering a gradual assimilation. According to the Borg Queen, half the population would be drones before the effects were discovered. (VOY: "Dark Frontier")
It is uncertain whether this plan came to fruition, but it was likely never applied. According to the non-canon novelization of "Endgame", the nanoprobe virus was brought to Earth and rapidly infected the population.
San Francisco attacked

Starfleet Headquarters on Earth, damaged after a Breen attack

Climate and geography

From at least the dawn of Humans, Earth had been a Class M world by 23rd century planetary classification standards. Earth had several major landmasses and a wide variety of climatic and surface conditions, ranging from tundra to desert. By the 24th century, Humans had installed a weather modification network to alter the natural weather patterns of Earth, including dissipating destructive weather phenomena such as tornadoes. (TNG: "True Q")

Land features, geographical markers, and formations

See also: Geopolitical Regions (Countries and States), Cities and Towns

In Art

Once Humans began leaving Earth in the 20th century, they photographed and drew pictures of the planet for various reasons. These pictures were then displayed in homes, offices, and recreation facilities. The earliest depictions of Earth were from the space agencies which sent Humans into space. These included official mission photos and insignias. Many of these images were preserved into the 22nd century and beyond. (TOS: "The Cage", ENT: "First Flight"}

Human-created points of interest

The Atlantis project, if completed, would probably also be considered a Human-created point of interest. There was no evidence it was successfully finished, however.

Parallel universes and alternate timelines

Alternate timelines

Earth devastated

Earth 31st Century

Earth devastated in the 31st century

Earth was devastated in several alternate timelines. Accidental time travel from 2371 led to the premature death of Gabriel Bell in 2024, an altered future was created where the more inhumane wars of the 21st century left Earth a pre-warp civilization that never even expanded to the solar system. (DS9: "Past Tense, Part I", "Past Tense, Part II")

When the temporal agent Daniels was instructed to remove Jonathan Archer from the timeline in 2152 and bring him to the 31st century, an alternate future was created where the United Federation of Planets was never formed and Earth was almost completely destroyed. (ENT: "Shockwave", "Shockwave, Part II")

In 2370, a new past was created for Earth by the anti-time eruption, where 3.5 billion years ago, amino acids never combined with the first proteins, and life never formed on the planet. This was how the Q Continuum fulfilled its judgment to deny Humans existence. (TNG: "All Good Things...")


Nazi Territory

Nazi Territory in North America

In two alternate timelines, the history of Earth was significantly altered when Nazi Germany was not defeated in World War II. In one, Doctor McCoy saved the life of Edith Keeler in 1930. Keeler went on to form a massive pacifist movement in America, delaying the country's entry into World War II, allowing Nazi Germany time to develop the A-bomb first and take over the world. (TOS: "The City on the Edge of Forever")

In another alternate timeline, Lenin was assassinated in 1916, preventing Russia from turning to communism. This allowed Hitler to concentrate his war effort on the West. With assistance from the Na'kuhl, France and England were conquered before the American East Coast by 1944. (ENT: "Storm Front", "Storm Front, Part II")


Earth assimilated

Borg-assimilated Earth

In an alternate timeline, the Borg were successful at preventing First Contact in 2063 and assimilated the Earth. In 2373, the assimilated Earth had an atmosphere containing high concentrations of methane, carbon monoxide and fluorine. It had a population of approximately nine billion Borg drones. (Star Trek: First Contact)

In its assimilated state, Earth was represented with CGI done by Alex Jaeger. (Star Trek: The Next Generation Sketchbook: The Movies, p. 335)

Earth destroyed


Earth, moments before exploding

The Earth was completely destroyed in two alternate timelines. In one of the timelines, Jonathan Archer's brain was infected by interspatial parasites and Earth was destroyed by the Xindi superweapon in 2154. This timeline was erased in 2165 when the parasites were destroyed by a subspace implosion aboard Enterprise - because the organisms existed outside normal spacetime, their elimination prevented Archer from ever being infected in the first place. (ENT: "Twilight")

In another alternate timeline, Earth and the entire solar system was destroyed by a massive temporal explosion in the 29th century. The explosion was caused by Henry Starling, when he used the stolen timeship Aeon to travel from the 20th century into the 29th century through an unstable temporal rift. (VOY: "Future's End", "Future's End, Part II")

Alternate reality

Narada fires a mining beam into Earth

Narada firing on Earth

In the year 2258 of the alternate reality, the Romulan mining vessel Narada fired on Earth using a drill platform. Nero was attempting to dig a hole to Earth's core and create a black hole using red matter to destroy the planet. Luckily, Spock was able to destroy the drill well before it could reach the planet's core. (Star Trek)

Mirror universe

USS Defiant orbiting Earth, 2155

The USS Defiant in orbit of mirror Earth

Karl Four

Karl Four on the planet Arret

In the mirror universe, Earth's counterpart was the capital of the Terran Empire. History followed a similar yet skewed course on this Earth, by comparison to the history of Earth in the United Federation of Planets, with a more violent, war-ridden past. According to Jonathan Archer, the Empire existed "for centuries" prior to 2155. As a result of the official First Contact with the Vulcans in 2063, Earth gained interstellar technology, allowing the Empire to expand. (ENT: "In a Mirror, Darkly")

The Klingon-Cardassian Alliance conquered the Terran Empire sometime before 2370. (DS9: "Crossover")

Professor Jennifer Sisko had an image of Earth on a uniform she wore while working for the Alliance in 2371. (DS9: "Through the Looking Glass")

According to William Shatner's novel Spectre, dealing with the mirror universe, Alliance ships destroyed the Imperial fleet in their version of the Battle of Wolf 359, and proceeded to reduce mirror-Earth to a barren wasteland. Humans were enslaved by the Alliance.
In Decipher's Mirror Universe, Earth is subjected to a Klingon planetary bombardment during the fall of the Terran Empire. The western half of North America is reduced to wasteland, Ireland and New Zealand are smashed into tiny islets, and the new continent of East Africa is created when a faultline is cracked open. In the aftermath, Earth's cities are rebuilt by the Alliance as giant labor camps and factory complexes. Kolara (the former site of Paris) houses Alliance officials.

Reverse universe

In the reverse negative antimatter universe, where the flow of time was reversed, Arret was Earth's counterpart. In 2270, Karla Five and her son Karl Four helped the crew of the USS Enterprise to return back to the prime universe. (TAS: "The Counter-Clock Incident")



Related topics

Background Information

In such episodes as TOS: "The Cage" and TAS: "How Sharper Than a Serpent's Tooth", the name Earth was used interchangeably with Sol when referring to the whole Sol system.

The star chart seen in the episodes The Naked Now, The Last Outpost and Conspiracy, naming stars within 20 light years of Sol was drawn by Rick Sternbach for the Star Trek Spaceflight Chronology in the late 1970s. Found on page 77, this chart showed Earth commercial and exploration routes after the use of warp drive began. The Explored Galaxy star chart was first seen, chronologically, in Star Trek VI: The Undiscovered Country, set in 2293. It was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370.

According to Star Trek: Star Charts (Pgs. 32, 36-37, 56-57, "United Federation of Planets I"), from 2113, Earth had been governed by the uniglobal United Earth government. The government of Earth was divided into six major regional powers that were governed from their respective capitals. These capitals were San Francisco (North America), Paris (Europe), Kyoto (Asia), Lima (South America), Cape Town (Africa), and Christchurch (Oceania). In 2161, Earth was a founding member of the United Federation of Planets. The dominant species were Humans and Cetaceans. Earth was a hub world on the mid-22nd century Earth trade routes. It traded with Alpha Centauri, Altair, Andoria, Denobula Triaxa, Draylax, Ophicus Colony, Tellar Prime, Trill, Vega Colony, and Vulcan. In 2378, Earth was a hub world on the major space lanes. In the census of 2370, there were counted 4.2 billion Humans and 8.1 million Cetaceans living on Earth. Points of interest included the UFP Council Chambers, Starfleet Headquarters, Starfleet Academy, Cochrane Memorial, Yosemite Valley, and Angel Falls.


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