The whole Milky Way at true scale, and a ship you walk while she flies.
A first-person space simulation on Unreal Engine 5. Get up from the helm mid-cruise and walk the Calliope's two decks while her crew of seven keep their watches. Fly true Newtonian physics on a HOTAS to any of 111 billion stars, the real ones where astronomers have measured them, land on procedural worlds and walk to the horizon, dive into gas giants to their crush depth, and jump to other galaxies. Set in the Freeholds in 2538.
Every feature on this site carries one of three words: in the game, in development, planned. These six are in the game.
The Calliope is a ship you live in. Her two decks and ten rooms are walkable in flight: the ship is the anchor of the simulation, so you stand up from the helm mid-cruise and walk aft while the sky keeps moving past the windows. Her crew of seven live aboard: Arien Sarhavi at navigation, Cassie, Kade, Corso, Ellis, Odile, and Talos, a bronze robot deck hand. They keep a watch bill by the hour, sleep in their bunks, eat together at the wardroom table and cover each other's posts.
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. Over Luna, other ships land beside her.
The Milky Way in the game holds 111 billion stars, from a published model of our galaxy, and you can fly to any of them. Where astronomers have measured a star, it is the real one: 119,626 stars from the HYG database, corrected against Gaia DR3, Hipparcos, XHIP and the Washington Double Star Catalog. Everywhere else the simulation generates the stars Earth has not catalogued, and builds each one's planets the moment you pick it. Zoom out past the Milky Way and the map becomes a map of the universe.
In-game captureGalaxy map, G119,623 stars drawnPre-alphaBeyond the Milky Way: the Local Group, the 2MASS Redshift Survey's galaxies and an endless procedural universe past them, on the universe map and one jump away.
We are building the most scientifically accurate space simulator made for a home computer, and in planetary science we already are. Every model starts from published astronomy, with the paper named.
Pax Abyssi is in pre-alpha. We have not set a release date, and the team is making excellent progress: the devlog shows it every week. The wiki is open to read now: every page carries a science status and cites its sources, and its text is CC BY-SA 4.0.
Stars, planets, black holes and neutron stars as science pages with provenance on every value; the setting as lore pages, marked as fiction.
No release date yet, and no public build. The plan is two releases on Steam: a free astrophysics edition with the galaxy map and the orrery, then the full space simulation to buy.
A devlog every week, straight from the studio, with pictures from the game: what the team built, and what comes next.
