Image from Wyrmshadow
- Lok Mai - Text by Four
Red dwarf system near Sol. A former member of the Eridanus League.
- 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.
- Quadaa Atonement Centre - Text by Anders Sandberg
Small O'Neil orbital in the 07-71-01117-IN system near Zamzam, inhabited by a Umma order calling themselves the Friends of the Muwakkil.
- Rainbow Coalescence - Text by Darren Ryding
Extremely diverse habitat cluster in the Archaipelago. Central to the tragic events of the Archaipelago Attacks of 8400 AT.
- Rajasekar - Text by Anders Sandberg
Tau 1 Gruis / CD-4913988 II; a failed colony world.
- 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
- Raman's World - Text by M. Alan Kazlev
(Omega 2 Cygni VI) Solar Dominion, formerly Cygexba administered territory, former site of the Summer solid-state civilization. See also The Summer Debacle.
- Ran (Epsilon Eridani) - Text by M. Alan Kazlev, revised by QwertyYerty 2018
Former member of the Eridanus League, currently part of the EpEri Combine.
- Rangar (Etaran System) - Text by ROM 65536
( Etaran / HD 148071 ) - Negentropist world with mysterious rings of artificial origin.
- Ratakhtona - Text by M. Alan Kazlev from original by Kevin Self
Important major mining and industrial base for a number of Vedokiklek hives.
- Ratay's World - Text by M. Alan Kazlev
Economically minor, but loyal Negentropist world in the outer Crucis Corridor, home to the cyborg statesbeing Malhotra Castander and the Siow-Wang Circle (of which he remains the most famous representative). Despite TrueModel pranks, xenophobia, and anti-TrueModel feeling, Castanander correctly predicted in the 8400's that the remaining TrueModel aioid clades would be more inclined to accept standardization with the main body of the Negentropist Alliance.
- Recpub Tauri - Text by M. Alan Kazlev
Important Metasoft world.
- Refugium - Text by Anders Sandberg
Capital of the Refugium Federation, settled in the 6th millennium by the Semperist Survival Fleet.
- Regulus - Text by person43
A bright multiple star system with an extinct biosphere discovered on one planet, also site of early star-lifting experiments.
- Relay001 - Text by Todd Drashner
The first major wormhole plexus and relay system built in the Inner Sphere. Became the model for later Relay systems.
- Relief - Text by John B
NoCoZo system in which there there are effectively no crimes if one can pay. There are five main habitats; two cater to the extreme pleasure market and three to hunting and aggression.
- Remagar - Text by Todd Drashner
Garden World currently in the midst of an Ice Age.
- Remnant, The - Text by Rhea 47
A failed early Terragen colony, now home to an ecosystem of sub-turing bots
- Rengood - Text by Steve Bowers
Cyberian World in Aquila - attacked in the early stages of the Version War
- Rergenar - Text by M. Alan Kazlev
Important Communion of Worlds member-system near Heartland, where Mykultura first flourished.
- Reserve, The - Text by Anders Sandberg and M. Alan Kazlev
Volume of space centered around a group of stars apparently involved in an old transcendent civilisation. The volume stretches in a rough tetrahedron from the red dwarf 594-456111, the sun-like stars Alpha and Eta Filiae and the wisp of dark cloud locally called the Mouthpiece. It has numerous terraformed planets teeming with life, but is aggressively protected by both local nanosystems and several Caretaker Gods. What lies inside is unknown.
- Revoltpri - Text by Anders Sandberg
MPA system, used by the AIs of Kiyoshi as transit point and storage of wormhole pairs.
- RG Vijayanta III - Text by M. Alan Kazlev
Terraformed by HIE236PPE.
- Rho Bentharis - Text by Aaron Hamilton
Hov's'sa home solar system.
- Ribblehead - Text by Steve Bowers
In the MPA hinteregions, the third planet in the Pen-y-ghent system, home to 500 distinct low tech nation-clades.
- Ridgewell - Text by Anders Sandberg
Chi Herculis V, Eugaian with indigenous xenecology.
- Rigel - Text by Steve Bowers
O-class blue giant, an important Metasoft system. Rigel is an important Metasoft power producing star, with a clade of cyborg-human Backgrounders living in the local Oort cloud. It is very close to the Orion Federation but not actually part of it.
- Robertson - Text by M. Alan Kazlev
The Savannah Orbitals around Robertson are home to the largest existing colony of Australopithecine hominids.
- Robinson's World - Text by M. Alan Kazlev
Known for its alien ruins.
- Rocklake - Text by M. Alan Kazlev
Recently rich and developing Outer Sphere world, important regional center, linked to main wormhole nexus. Popular with a number of clades, including young House Stevens radicals disillusioned with "House Ridgewell".
- Rosette - Text by Todd Drashner
World complex located in the Inner Sphere system of Trinity.
- Rosette Cluster - Text by M. Alan Kazlev
Heavily populated and prosperous NoCoZo-TRHN tourist system, home to a number of hedonics corporations and experimental habitats and lifestyles.
- Rosmion - Text by Steve Bowers
Icy world heated by an artificial ring of mirror particles.
- Ross 248 - Text by Steve Bowers
Flare star near sol
- Ross 614 - Text by Steve Bowers
Twin Matrioshka Brains around a binary red dwarf near Sol.
- Ruach - Text by Steve Bowers, from an original by Anders Sandberg
54 Hydrae B-II. EuJovian Type world home to a rich ecology of jovibiota.
- Rudolph - Text by Ernst Stavro Blofeld
System of worlds catering to the combat-fetishism market.
- Rufus - Text by Steve Bowers
A planet with five moons, mostly inhabited by Dog provolves.
- Rungworld - Text by Steve Bowers
Site of an early Oracle-related conflict. The Rungworld includes several hundred 10,000 km McKendree Cylinders linked together in a ladder-like ring.
Text by Orion's Arm Editors
Initially published on 31 December 2007.