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Pax Abyssi
Xi Bootis V, a blue ringed ice giant, seen whole from four radii against the stars
01 // Pre-alpha 0.1.0 . Windows PC

Pax Abyssi

A whole galaxy at true scale, and a ship you can walk.

A first-person space simulation on Unreal Engine 5. Fly true Newtonian physics on a HOTAS through 119,626 real stars, land on procedural worlds and walk to the horizon, skim gas giants with weather of their own, and fly to black holes drawn by their physics. Set in the Freeholds in 2538.

Catalogue stars
119,626CatalogueHYG database, corrected against Gaia DR3, Hipparcos, XHIP and WDS
Worlds you land on
8procedural, whole
Gas giants
1,965each with its own weather
Build
0.1.0pre-alpha, Windows PC
02 // In the game

What you can do today

Fly, walk, land, skim, fall toward a black hole, hold the wire. Every feature on this site carries one of three words: in the game, in development, planned.

03 // The Calliope

Fly her on a Warthog. Then get up and walk aft.

Two levers drive two engines, each with its own start, fuel and failure. Her reactor, power bus, helium-3 and life support are live systems you read off the overhead panel, built after the Boeing 737's. Her water is her propellant and her radiation shield: a 20 tonne jacket, and the dose model behind the cabin readout agrees with flown dosimeters, from the ISS to Curiosity, within a factor of two.

The crew are on board: Arien Sarhavi at navigation, Cassie, Kade, Corso, Ellis, Odile, and Talos, a bronze robot deck hand, keeping a watch bill and eating at the table. In space the ship is the anchor, so you can stand up mid-cruise and walk aft while the sky keeps moving. Over Luna, other ships land beside her.

Decks
2
ten rooms, walkable in flight
Crew
7
named, with faces
Engines
2
left and right, on two levers
Sky fleet
82hulls
flying real physics
In the gamewalking in flight, ship systems, HOTASThe ship, in depth
In-game capture, Build 0.1.0
04 // The galaxy

We began with the stars that have the best data

119,626 stars from the HYG database, corrected against Gaia DR3, Hipparcos, XHIP and the Washington Double Star Catalog, sit where astronomers measured them, each with a generated system. The rest of the Milky Way, 111 billion stars from a published model of our galaxy, is generated by the same simulation and arrives next.

The in-game galaxy map as it opens, the catalogue stars of the neighbourhood with faction territory outlinesIn-game captureGalaxy map, G119,624 stars drawnBuild 0.1.0
The galaxy map (G) as it opens: the stars around the current system, with faction territories drawn as outlines.
In-game capture, Build 0.1.0, galaxy map
01 // On the map

The sky today

In the game
Stars
119,624Catalogue
Named
6,631Catalogue
Known pulsars
4,393Catalogue
Known black holes
113Catalogue
Star clusters
7,304Catalogue
Generated systems
5,160Sim
Stations placed
2,457Sim

Next: the whole Milky Way on the map, 111 billion stars from a published model, generated around the real ones. In development

05 // Science

The physics under the sim

Every system starts as published astronomy, with the paper named. It is where Pax Abyssi is strongest.

Catalogue stars
119,626
HYG, corrected against Gaia DR3, Hipparcos, XHIP and WDSCatalogue
In the game
Generated systems
5,160
8,751 planets and 7,495 moons, solved for 2538-01-01Sim
In the game
Known compact objects
4,881
4,393 ATNF pulsars, 113 black holes, 375 more neutron starsCatalogue
In the game
Kerr ray against the oracle
0.013px
99th percentile at 1920 wide, Gralla and Lupsasca 2020Sim
In the game
Kepler solve against the original
0.8mm
across nine bodies, per-tick propagationSim
In the game
Radiation dose model
2x
within a factor of two of measured, from the ISS to CuriositySim
In the game
Features

The science, shown working

All articles
06 // Community

A wiki of the real sky, a forum, and a weekly devlog

The wiki and the forum open with the first public build. Wiki text is CC BY-SA 4.0, every page carries a science status and cites its sources, and the devlog comes out every week with pictures.

Wiki

Codex

In development

Stars, planets, black holes and neutron stars as science pages with provenance on every value; the setting as lore pages, marked as fiction.

Forum

Communities

In development
  • Announcements
  • General
  • Science and astrophysics
  • Screenshots and media
  • Ideas and feedback
  • Bug reports
  • Wiki talk
Follow

The development

The weekly devlog and build news, straight from the studio. One account for the wiki, the forum and the API.