At the center of human space lies the Inner Sphere, also known as the Core, the Old Worlds, the Local Bubble, the Centre, the Hub, or the Alpha Region. It is a roughly spherical region containing the earliest colonised worlds, and is approximately 200 light years in diameter. It is the home to many of the oldest cultures or inhabited worlds, and contains many capital systems and a dense branching of wormhole links. Due to the age and historical complexity of the region many empires and other political units overlap or mesh within it.
As Terragen civilization spread, much colonisation occurred radially outwards, making most of the main empires look roughly like pyramidal frustrums. This tendency was emphasized by the wormholes, as the expense of wormhole building and the constraints of wormhole connections led to a treelike topology with the root near the core and the branches extending outwards. This radial structure has led to the core practice of naming regions or radial directions after the ancient Anglic Old Earth constellations. For instance, "Centaurus" refers to the pyramid extending from the Sun in the Centaurus direction. This is what is meant when someone says that the Solar Dominion mainly lies in Ursa Major, Canes Venaticorum and Lynx. This is of course both inexact and solarocentric, but it works most of the time and is widely used by interstellar cartographers.
In the outer parts of inhabited space the radial pattern breaks down, as the colonisation fronts grow increasingly diffuse and are often affected by the density of habitable worlds, wormholes or other features. There, the empires dissolve into a mess of independent clusters, isolated worlds, and small colonisation spheres launched from especially vigorous cultures.
Alcor and Mizar - Text by Steve Bowers These two star systems in the Plough are an important point of contact between the Solar Dominion and the Solipsist Panvirtuality.
Alpha Centauri A+B - Text by Steve Bowers and John M. Dollan Colonised by Von Neumann Machines (neumanns) in the late Interplanetary Era; these self-replicating machines were designed to be self-evolving and independent, and rejected any further human contact once they arrived. This led to the loss of the resource-rich Alpha Centauri system.
Altair - Text by M. Alan Kazlev Fast-rotating A7V star, originally part of the Diamond Belt, in the constellation Aquila (the eagle), 16. 5 light years from Sol. The name Altair means "flying eagle" in Old Earth Arabic.
Anahita (Gliese 249) - Text by M. Alan Kazlev, updated by The Astronomer 2021 Inner Sphere system; Anahita was originally colonized by Dionysians during the expansion of the Erotocracy. After its dissolution it became part of the Conver Ambi, but retained extensive contacts with other Inner Sphere worlds. Currently a Metasoft system.
Arcturus - Text by M. Alan Kazlev (Alpha Boötis) A centre of the distributed Cyberian Network. Seen from Sol this is the brightest star in the constellation Boötes (the herdsman). It is a red giant (spectral type K1.5IIIp). Arcturus is 34 light-years from Sol. It has an absolute magnitude of 0.2.
Arcturus Sector - Text by M. Alan Kazlev District of space with irregular borders of 10 to 20 LY on side, the most notable astronomic feature is the red giant Arcturus. This region is home to a number of small independent polities. There is a fairly strong Cyberian presence in the region.
Bourgatov - Text by Anders Sandberg (Theta Persei III) Formerly one of the most populous systems of the Inner Sphere, at its height home to 34 billion humans, splices and vecs. Wiped out by a collapse at the end of the Second Federation.
Branswerg - Text by M. Alan Kazlev CD -30°19255 - Important inner sphere system - one of first Keterist worlds to be established, includes a sizable neodolphin and post-neodolphin population.
Capella - Text by M. Alan Kazlev Multiple star system containing in total 9 stars in the constellation Auriga, about 43 light years from Sol. The two brightest stars in Capella are a binary star system. Long populated by a variety of exotic clades and hyperturings, Capella became the capital of an important regional polity in the wake of the ComEmp break-up.
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.
Ihikkk (Zeta Tucanae IV) - Text by M. Alan Kazlev In Anglish, Snowwhite. A glacial world just outside the life zone, covered with massive ice sheets, terraformed to produce a glacial ecosystem rather than a temperate ecosystem.
Karol Ring, The - Text by M. Alan Kazlev A Banks Orbital constructed at HD 144585, Kiyoshi Sector, MPA, during the Empires age. A center of finance, edutainment, recreation, and historical and fabulist recreation.
Local Bubble - Text by M. Alan Kazlev "Low density" plasma region of space left by former supernova some tens of millions of year ago. Approximately equivalent to the Inner Sphere.
Lok Mai - Text by Four Red dwarf system near Sol. Daughter colony of Sonthaya.
Lombardo - Text by M. Alan Kazlev Inner Sphere NoCoZo system, was first established as a Free Zone during the middle Federation period. The system is inhabited by corporate hyperturings, vecs, and near-baseline bionts and cyborgs.
M'Buto - Text by M. Alan Kazlev Inner Sphere system, home of a number of diverse clades. Joined the Virginis Combine, later became part of the Conver Ambi, in turn annexed and assimilated by the Solar Dominion. Broke free after the Version War to become a joint Metasoft-NoCoZo administered system.
Noyce - Text by M. Alan Kazlev Inner sphere NoCoZo system also known as Hokon's Third Purchase, approximately 90 LY from Sol.
Nuisweden - Text by M. Alan Kazlev Autonomous large demopoly near the outer part of the Inner Sphere, some Negentropist and Terran Federation affiliation. Site of alpine forests and the prestigious Sondheim Academy where Stig Ranes studied.
Qjellto - Text by Anders Sandberg Former Cygexba world. Terraformed in 2100 and settled in 2344 by retrists and low-tech peripatetics. It developed quietly until 2654 when an outbreak of the Babel plague destroyed the language centers of 78% of the population. As coordination broke down, even the relatively simple society of Qjellto crashed.
Yang - Text by M. Alan Kazlev Brown dwarf near Solsys, site of one of the first beamrider colonies and stations. During the dark ages a number of clades settled or developed here. Currently a prosperous and diverse old core system and beamrider nexus.
Zarathustra - Text by Anders Sandberg A colony that recovered from near-collapse to become one of the most successful in the Inner Sphere.
Zavijava (Beta Virginis) - Text by M. Alan Kazlev and Anders Sandberg An important Inner Sphere region, home to the famous planet Pacifica. Most polities are members of the Virginis Combine and are loosely aligned with the Utopia sphere or Solar Dominion, though they are a diverse group.