Xenosophonts

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Xenosophonts

As Terragen civilization has spread into the galaxy, it has encountered both living aliens and the remains of extinct aliens. Some of them once built vast empires but have since vanished but for a few enigmatic traces, and indeed had been gone for millions of years before life even crawled up on dry land on Earth.

Telescopic examination of the Milky Way Galaxy in the Interplanetary Age revealed several locations where artificial emissions seemed to indicate the existence of advanced civilisations; but these locations were all more than ten thousand light years away. These civilisations (if real) were so far away they might disappear before any signals reached them. But would there be any closer civilisations that telescopes might not reveal?

Those early Terragens who were expecting a galactic community of civilizations in the region near Sol were disappointed. Space turned out to be empty and desolate, and aliens few and far between. The first remnant of alien technology, the fragmentary hull of a robotic satellite, was found orbiting Epsilon Sculptoris A in 1460 AT. This artifact was 196 million years old, a relic of the unnamed species HIE636MZE.

Although a few of the alien sophont races that have been discovered so far have willingly joined the body of Galactic society, others are aloof or reclusive, lack interest or are unable to understand such concepts. Some, like the Meistersingers and the Wayfarers, appear to have some measure of contact with the more distant galactic civilisations, but so far they decline to share any significant information concerning these topics.

The most extensive alien empire that has so far been contacted is that of the Muuh; at first believed to be merely a faded remnant of an ancient empire, these slow, low-temperature creatures in fact have a large and widely dispersed network of colonies which are protected by utterly alien AI weapons systems.

Not one single alien race has been found to be similar in physiology to any metazoan life form that originated on Earth, and the process of panspermia has been shown to have had only a minor effect on the emergence of life in the Terragen Sphere. This is not to say that former races did not engage in terraforming and provolve both their own local and other species, for some of them clearly did.

Recent exploration has shown that some xenosophont empires, such as the Tkzeph Empire and the Auld Limners, were much more extensive than had previously been believed. This invites even more the question of how such mighty empires could remain for tens or hundreds of thousands of years, and then suddenly disappear. Speculation ranges from mass transcension to doomsday weapons and mysterious robot warships, and consensus regarding the answer remains elusive.

Sub-Topics

Alien Civilisations Outside the Terragen Sphere

Cthonids

Hildemar's Knots

J'Ta'ush

Jeepers of Mik's Planet

Articles

AI, Alien - Text by Anders Sandberg, amended by Steve Bowers
There is much speculation, but rather less knowledge, on the psychology of ais from from non-Terragen races extinct or extant.
Alien - Text by M. Alan Kazlev
Generic term for any non-terragen sapient being. The term xenosophont is also equivalent.
Archivists - Text by Richard Baker
Vanished builders of certain hi-tech objects.
Artificially Optimised Galaxies - Text by The Astronomer
Galaxies optimised for habitation by unknown xenosophonts.
Asoka's Pillar - Text by ProxCenBound
An alien Dyson cylinder outside the galaxy, sending strange signals.
Auld Limner - Text by Peter Kisner, M. Alan Kazlev and Anders Sandberg
Perseus Arm (and possibly also Outer Arm) space-faring predecessors of the Limners.
Beacon Project, The - Text by Todd Drashner
An attempt to contact extragalactic intelligence.
Black Acropolis - Text by Anders Sandberg
A Dyson swarm built by a vanished civilization that has since been colonised by a number of other species
Black-Hole Brains of NGC 4651 - Text by Steve Bowers
A civilisation in the Virgo Group of galaxies that lives in close association with black holes.
Chahipho Collection - Text by Anders Sandberg
Major art collection in the Vast Endeavour system gathered by the AI godlet Chahipho in the Era of Fragmentation.
Chorus - Text by Stephen Inniss
Homeworld of the xenosophont provolves the Jade Chime Singers.
Cormoran SMBH Civilisation, The - Text by Steve Bowers
Alien Civilisation 209 million light years from Sol.
Daidarabotchi Megadyson, The - Text by NexusEye
An artificial hyperobject in a distant galaxy
Dawn Hunters - Text by Anders Sandberg and M. Alan Kazlev, with additional suggestions by Steve Bowers.
Apparently mythical entities from the galaxy's ancient past.
Dead Drifter - Text by James Rogers
A deceased xenosophont found drifting through space in Sagittarius, during the late First Federation Age, the only recovered specimen of the (presumably) extinct alien species HIE091MZE.
Deep Traveler, The - Text by Todd Drashner
Mobile Dyson shell recently discovered by IR astronomy in intergalactic space approximately 23 million ly away.
Deepwood - Text by Todd Drashner
Deep space orwood species of probable alien origin.
Doreen/Doreens - Text by Stephen Inniss, expanded and amended in 2018-2020 from original material by Anders Sandberg
Chlorine world, former home of the extinct Doreens.
Drake Equation - Text by M. Alan Kazlev
An early (pre-interstellar age) attempt to estimate the number of civilizations in the galaxy, according to the statement that the fraction of stars harboring intelligent life equals the number of all stars times a sequence of fractions, such as the fraction of all stars having planets, the fraction of planets that are habitable, and so on.
Dyglufsare - Text by Anders Sandberg
Marsh-dwelling xenosophonts.
Empire of Screaming Skulls, The - Text by Steve Bowers
A distant xenosophont civilisation observed only by telescope.
Energy Emissions and Civilization Types - Text by ProxCenBound and The Astronomer
A common method for classifying xenosophont civilizations by their energy emissions.
Enforcer Objects - Text by Steve Bowers
Automatic stealthy weapons left behind by extinct aliens
Epsilon Sculptoris - Text by Steve Bowers
Binary system 89.5 light years from Sol.
The first alien artifact, a fragmentary hull of a autonomous vessel, was discovered here in 1460 AT. This artifact was 196 million years old, a relic of the unnamed species HIE636MZE.
First Contact - Text by Steve Bowers
Strategies and policies for contact with alien life forms (xenobiota) and Xenosophonts (intelligent alien life).
Galactic History - Text by M. Alan Kazlev
Branch of science and school of philosophy dealing with the history of mindkind in the Galaxy as a whole.
Garden Worlds - Text by AstroChara, Steve Bowers (2020)
Worlds that support a complex biosphere and macroscopic life forms.
Golden Tower Builders, The - Text by M. Alan Kazlev
Extragalactic alien civilization known to have built planetary megastructures.
Halogenics - Text by Stephen Inniss
The Halogenics are a hypothetical clade or group of clades, now believed to be extinct. They seeded a large number of chlorine worlds about 780 million years ago.
Hedrile - Text by Loopquanta
A presumably artificial wormhole of unknown design, origin and destination; it has not yet been traversed successfully.
HIE-019-CZE (Hutamaheen) - Text by Steve Bowers
Extinct civilisation responsible for terraforming several planets in the Middle Regions and Inner Sphere
HIE-072-CZE (Lhagharians) - Text by Aaron Hamilton
Species which withdrew from the Orion Arm 5.4 million years ago.
HIE-121-CZE (The Lost) - Text by Aaron Hamilton
Xenosophonts which vanished 31 million years ago.
HIE-156-CZE (Jesters) - Text by James Rogers
Extinct alien species known only from ancient Muuh records.
HIE-201-NPE (Batholithics) - Text by Steve Bowers
An extinct civilisation that took refuge in bunkers deep in their planet's crust"
HIE-233-MPE (Jacks) - Text by Anders Sandberg; expanded by Stephen Inniss
The Jacks (officially known as HIE-233-MPE) are a xenosophont species, or possibly a cluster of related species, named for a toy of ancient human baseline origin called a "Jack-in-a-box". Their name springs from the fact that they are apparently neither extinct nor extant; instead they have "popped up" several times in the past and may or may not return at some point in the future.
HIE-300-CZE (The Bad Idea) - Text by Steve Bowers
Predatory species provolved by the Muuh; hopefully extinct.
HIE-565-MZE (Moundbuilders) - Text by Aaron Hamilton
Xenosophont species known from 125 million year old ruins on a single planet; apparently this species became extinct without developing interstellar travel.
HIE-636-MZE (Makers) - Text by Aaron Hamilton, updated by Steve Bowers
The first indisputable physical relic of an alien civilisation capable of extraplanetary activity, discovered in orbit around Epsilon Scuptoris A in 1465 AT by a First Federation Exploration mission.
Hiiiw--waan-w - Text by M. Alan Kazlev and The Astronomer
A cold planet seeded by the Titanian Sowers, an extinct xenosophont race, and now supports an ecology of cold-adapted lifeforms. These lifeforms share a common ancestry with those found on 13 other worlds.
Hildemar's Knots and the Einstein's Revenge Cluster - Text by Liam Jones
Alien species inhabiting neutron stars in the Einstein's Revenge Cluster.
Hollerith Anomaly Object - Text by Håkan Andersson
A nebula in the Chronos Cluster that contains a nanecology, some semi-sentient entities, and a number of odd phenomena. It is believed to have been left behind by a xenosophont civilization, now no longer evident and assumed by some to have transcended.
Hov’s’sa (HIE-015-PZE, the Bentharis II Civilization) - Text by Andrew P., based on the original by Aaron Hamilton
Extinct aquatic xenosophonts (possibly mythical).
Hygeras Object - Text by Aaron Hamilton
Mysterious alien artifact.
Hyraians - Text by Tsochar, with some additions by Steve Bowers
An extinct alien race that produced human-like wall paintings.
Iahi Daon Empire - Text by Aaron Hamilton, some comments by Steve Bowers
Xenosophont species extinct for more than 7 million years; known only from remains on the former homeworld and from some massive generation ships.
Inhibitor - Text by M. Alan Kazlev
Hypothetic super-powerful alien race or races proposed to explain why most advanced civilizations fail after only a few tens of thousands to a few millions of years. The Dawn Hunters are the most popular example of inhibitors, although it is not known if they even exist, or if they do, if they really are inhibitors.
Ishtar's Necklace - Text by Liam Jones
Ancient xeno megastructure in the Carina Rush.
Joker Leaf-ants - Text by Steve Bowers
Sarcastic and dangerous alien lifeforms
Labyrinth - Text by Todd Drashner
Mars like world toward the outer Perseus Arm, known for its alien tunnel complex.
Leo Hyperobject 1 - Text by Steve Bowers
Vast megastructure 339 million light years from the Milky Way, in Abell 1367
Metric Ghosts - Text by Todd Drashner
Unusual, apparently highly mobile, distortions of space-time metric.
Miracle City - Text by Anders Sandberg
A planet/megastructure constructed by a former xenosophont civilization that is encrusted with fractal buildings that extend far into orbit.
Mucoid Empire - Text by Steve Bowers
Possible alien civilization running on virtual environment on Panvirt ai cluster.
Mysterian - Text by M. Alan Kazlev
The name used by the local populace to describe the long vanished civilisation of alien origin who terraformed Ararat II, also known as HIE-014-CZE. The Mysterian jungle is made of the numerous plant/jellyfish creatures that have taken residence on the planet and, through accident or not, and outlived the mysterians themselves.
Mythical Xenosophonts - Text by John B with additions by Steve Bowers
Legends of hidden aliens in the midst of the Orion Arm civilization.
Oceanus Ultimata - Text by Todd Drashner, with some comments by M. Alan Kazlev and Anders Sandberg
Star in Carina Outer Volumes surrounded by an artificial water ocean-ring.
Pas'utu'ril - Text by Radtech497
Xenosophont civilization in LMC galaxy
Porrima - Text by M. Alan Kazlev
Twin stars where the first high technology non-Terragen artifact — a derelict alien starship — was discovered in 3752 by the Virginis Combine ship Fra Angelico. The system is currently Solar Dominion protectorate inhabited by a number of bioid and cyborg clades. There is a small but well-equipped Exoarcheology Institute, and a highly accurate reconstruction of the Fra Angelico, along with a superficial reconstruction of the artifact, is a popular tourist attraction.
Postalien - Text by M. Alan Kazlev
A non-Terragen (alien) who has attained the status of an S1 or higher transapient. Sometimes called a postxenosophont.
Rak Mesba - Text by Radtech497
A xenosophont megastructure in the form of a circumstellar disc
Raksha - Text by Steve Bowers
A weird moon with alien ruins
Restorers - Text by M. Alan Kazlev
Like the Dawn Hunters, a possibly mythical ancient race.
Search For Non-Terragen Intelligence - Text by Steve Bowers, additions by Stephen Inniss
A large number of xenosophont civilizations have been detected by their emissions but have not been contacted due to light-speed lags. Some seem to be comparable to the Terragen Sphere in extent.
Secrets Inscribed in Caustics - Text by Liam Jones
Secrets Inscribed in Caustics is a largely abstract environment designed to accommodate many alien mindform types
Semblance of Eternity - Text by Matt, Dagon, and John B
Disputed alien artifact.
Sextans Swarmers - Text by M. Alan Kazlev
Nanecology / nanoswarm detected across much of the NGC 3169 galaxy and some of NGC 3166. Its origin and toposophic nature is unknown.
Steelcliff - Text by Tony Jones
The first alien BGC system, discovered in 7852.
Sundrivers - Text by Todd Drashner
Alien civilization discovered in the Virgo cluster approximately 60 million ly from the Milky Way. The seem to be involved in a megascale project that involves the movement of entire stars.
Terraforming Remnants - Text by Anders Sandberg
Natural and artificial ecospheres left by any of several long-vanished terraformer species known only for the biospheres they left behind long ago. Currently terragenkind is busy terraforming suitable planets in the galaxy, and even if they disappear there are going to be lots of human- and ai- derived biospheres left behind. In a few hundreds of millions of years intelligent life might evolve independently there. This life would find a few other habitable worlds with suspiciously similar biochemistries.
Thiogens - Text by Matthew C. Johnson
Extinct xenosophonts presumed to be responsible for a number of sulphurogenic biospheres on Vitriolic type worlds.
Thyresta - Text by Anders Sandberg
Extinct alien species, inhabited Tawattaran (YTS-4885002-3825 IV; MPA).
Titanian Sowers (HIE-236-PPE) - Text by The Astronomer and ProxCenBound, based on an original article by Aaron Hamilton
Ancient xenosophont civilization responsible for seeding a number of Titanian worlds
Tkzeph Empire - Text by Andrew P. and ProxCenBound
According to possibly mythical accounts, a theocratic/aicratic starfaring empire that disappeared without a trace some 312 million years ago.
Trader, The - Text by Radtech497
A mysterious xenosophont ship making its way along a circular trajectory that has brought it into the heart of the Soft Ones Volume.
Triangulum Transmission - Text by Todd Drashner
A complex message from another galaxy, giving details of several alien races.
Tunh Xenohole, The - Text by Anders Sandberg, with comments by Steve Bowers.
System with an alien Wormhole.
Ultimates - Text by Anders Sandberg and M. Alan Kazlev
A static, genetically optimized phylum of sophonts inhabiting the Black Acropolis.
Whisper - Text by Todd Drashner
Planet covered in a sophont grassland xenoecology, perhaps of artificial origin.
World of Meditating Idols - Text by M. Alan Kazlev
Sagrei c - first planet to be discovered with alien ruins (20th century AT).
Xenobiont - Text by M. Alan Kazlev
Generic term for alien (non-terragen) lifeform. May be animal-like, plant-like, protistan, exotic chemistry, or any other possibility. Does not have to be sophont. In fact just as on Earth, very few alien species ever evolve any measure of cognitive intelligence.
Xenomorph - Text by Steve Bowers
Any Terragen entity using an artificial alien (xenosophont) body for the purposes of cultural contact, exploration or colonisation.
Xenosophont Civilisations in the Laniakea Supercluster - Text by ProxCenBound and The Astronomer
Notable alien civilisations in the local galactic supercluster.
Xenosophont Gallery - Text by Various Artists
Images of the various Xenosophonts (Alien Species) in the Orion's Arm Volume