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- Qinglong (world) - Text by M. Alan Kazlev
EuJovian Type planet in the Penglai system - inhabited by Mirrored Owl swarm-nets Advection of Pure Drylines during the 4000's
- Qjellto - Text by Anders Sandberg
Former Cygexpa world. Paraterraformed in 2100 and settled in 2344 by retroists 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'Neill orbital in the 07-71-01117-IN system near Zamzam, inhabited by a Umma order calling themselves the Friends of the Muwakkil.
- Quint - Text by Ryan B
Virtual mega-society consisting of approximately one quintillion modosophonts housed in a matrioshka brain. Loosely affiliated with the Technorapture Hypernation.
- 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.
- Rajand (Lalande 21185) - Text by M. Alan Kazlev, updated by Steve Bowers and The Astronomer, April 2022
Inner Sphere system; early colonized Genetekker outpost.
- Rajasekar - Text by Anders Sandberg
Tau 1 Gruis / CD-4913988 II; EuGaian world where the local xenobiota combined with introduced Terragen biotechnology to form a short-lived hybrid technosphere. Later colonized by Stellar Umma, Sophic League and Mutual Progress Association.
- 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 Cygexpa administered territory, former site of the Summer solid-state civilization. See also The Summer Debacle.
- Ran (Epsilon Eridani) - Text by Updated by The Astronomer 2021
Inner Sphere system; the birthplace of the Eridanus League, Terragens' first known interstellar polity.
- 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
VedokiklekImportant 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.
- Realm, The - Text by Todd Drashner
Major Deeper Covenant civilization cluster located about 750 light-years to rimward of Sol. The Realm constitutes one of the largest centers of Deeper civilization in the Civilized Galaxy.
- Recpub Tauri - Text by M. Alan Kazlev
Important Metasoft system.
- 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 ProxCenBound
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.
- Resonance (TRAPPIST-1) System - Pre-Colonisation - Text by The Astronomer, Dangerous Safety
Red dwarf star 40ly from Sol
- Resonance (TRAPPIST-1) System: History - Text by The Astronomer
Events in the Resonance system, also known as the Seven Marbles, TRAPPIST-1
- Revoltpri - Text by Anders Sandberg
MPA system, used by the AIs of Kiyoshi as transit point and storage of wormhole pairs.
- 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 xenoecology.
- Rigel - Text by Trolligi
B8 Iae blue giant, an important Metasoft system. Rigel is an important Metasoft power-producing star, with a dense population of Backgrounders living in the local Oort cloud. It is very close to the Orion Federation but not actually part of it.
- Rihal (Ross 248) - Text by Steve Bowers
Flare star near sol
- 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 system, important regional center, linked to main wormhole nexus. Popular with a number of clades, including young House Stevens radicals disillusioned with "House Ridgewell".
- 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 614 - Text by Daniel Eliot Boese, Steve Bowers
Twin Matrioshka Brains around a binary red dwarf near Sol.
- Ruach - Text by Steve Bowers, from an original by Anders Sandberg
Neptunian 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.