The Nivenia System is the first star system in the Nivenian Empire, and is in the Coru Secondus Region of the Cyrannus Galaxy. The Nivenia System has been colonized almost to the fullest extent, with a total population of over a quintillion.


The Nivenia System contains a close DB3.3/L2.4 binary pair less than two million kilometers apart, and has a M9.9V star orbiting 460 AU away. 13 planets orbit the inner pair, with the last two bound together gravitationally as a double planet. The red dwarf has 5 planets orbiting it, all of them frozen and inhospitable. The fifth planet from the first binary, Nivenia Prime, is habitable, being about 79% of the diameter and 51% of the mass of Earth. It has a gravity of 7.9938 m/sec^2. Unfortunately for non-Nivenians, the accretion disc of the primary makes most of the system too radiation-blasted to support life that had not evolved there for long-term occupation (short-term visits are fine).

The primary itself has a mass of 1.14960 solar masses, and began as a medium-sized B-type star, and died billions of years ago, creating a massive carbon-oxygen white dwarf with strong He I spectral lines, giving it the DB stellar classification. The brown dwarf, weighing 0.0629713 solar masses, was formed from a massive hot jupiter that absorbed a huge amount of mass from the planetary nebula created by the death of the former primary, and fell into a lower orbit due to the resistance of the gas. This brown dwarf has a very high metallicity compared with the rest of the system, and so could not ignite nuclear fusion in large quantities and become a star. The secondary weighs even less, at 0.0396854, but still manages to fuse material due to its abnormally low metallicity.

Numerous changes have taken place in the system in the last few centuries. First, a significant portion of the light from both stars has been blocked by ringworlds. Second, several of the formerly icy and inhospitable worlds have warmed substantially due to waste heat, and have now been terraformed, and been largely transformed into Ecumenopoli.


The Nivenia System supports many of its inhabitants with ringworlds, circumstellar rotating habitats, mainly built by the Megastructural Construction Corporation and partially funded by the Nivenian Empire.

Radioactivity and Hyperdrives[]

The accretion disc of the Nivenia System primary undergoes so much friction that parts of it are undergoing nuclear fusion, and releasing huge amounts of X-rays. While the thick atmosphere of Nivenia Prime protects it from the brunt of the ionizing radiation by shifting it down to ultraviolet or visible through fluorescence, most of the space in the Nivenia System is quite nasty for anything technological. Without proper shielding, most life would have problems surviving for extended periods of time, and most advanced technology gets fried. The radiation has a particularly damaging effect on hyperdrives, so only hyperdrives advanced enough to be able to transport at least their own weight in shielding will survive. While already-starfaring civilizations can come and go as they please, hyperdrive development is impossible, and has been labeled a crackpot idea by the scientific community centuries ago. This is true to the extent that reverse-engineering a hyperdrive built by another nation is sometimes seen as a crackpot idea as well.

Another factor in Nivenian hyperdrive development is the fact that most of the industry in the system is dependent on the fact that ringworlds are constantly being built. As terraforming is generally less expensive per square kilometer than ringworld construction, most of the large Nivenian commercial interests are strongly against any hyperdrive research, making their development that much harder.

The Nivenian species can survive the intense radiation due to its history. Nivenians evolved on a planet bathed in radiation, so, like all of the lifeforms that evolved on Nivenia Prime, the Nivenian species had to evolve, or become a blob of cancer from the radiation. The second reason is that the huge nuclear war in the 670s BNE and the constant use of unshielded nuclear technology afterward reduced the fertility, on average, of Nivenians who were less tolerant of radiation.


See this page for more information and this page for specific demographics.

The Nivenia System contains an incredibly high population, which is mostly housed in artificial megastructures such as ringworlds, but a significant portion still live on planets. Great variety exists in the manner in which planets are inhabited, as conventionally inhabited planets, planets covered in distorted O'Neill cylinders for gravity-augmentation purposes, ecumenopolises, and aerostat-filled gas giants all exist in the system.

Entering and leaving the system[]

While in the past entering and leaving the Nivenia System would both require extensive authentication from the Nivenian Imperial government, with the Nivenian Imperial government is not fond of tourism, making the Nivenia System mainly visited by traders and political delegations instead of tourists, the current Nivenian Government has done away with border controls at the national level, and started a policy of free migration. Still, the interior of the Nivenia System is heavily industrialized, and is only really a tourist destination for mechanical and chemical engineers.

Inhabited planets and moons[]

The habitable five[]

Gas giants[]

Smaller inhabited planets[]

Non-planetary swarms[]


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