dev.20's full sky made the laptop stutter at Aldebaran. One line was scanning all 335,189 stars every frame. Fixed, measured on the MacBook Air, and the I key now shows the bodies around you.

The game now opens on a menu. Meanwhile the black-hole milestone is two-thirds built: the first renders of Sgr A*'s lensed sky are in, checked against general relativity to a fraction of a pixel.

Until now only the Sun and α Centauri had a size; every other star you visited was a point seen from 1,000 AU away. Now each star in the voyage is a real disc with its measured radius and temperature, and you arrive where its size means something.

The voyage now reaches a real planetary system, the ship is lit by whichever star it is near, and the sky holds six times more stars, each in exactly one place.

Every Solar System leg now has the same rhythm, about 2¼ minutes in real time: 30 seconds accelerating, about a minute cruising, then braking into a 25-second final approach. The longer legs simply go faster, above 0.999c to Jupiter and Saturn, so the planets now ease into view instead of appearing in the last few seconds.

The guided tour no longer fast-forwards. Every boost and every braking plays at one ship second per wall second, and special relativity, not a time-lapse, is what makes the trips short. Earth to Jupiter takes six minutes aboard while 39 pass on Earth. Then the voyage leaves the Sun behind: α Centauri, TRAPPIST-1 and Aldebaran, 120 Earth years later.

The painted ship and Solar departure tour share one perspective. This review build removes automatic sky dimming: exposure stays at your manually selected brightness while you move and look around. The tour finishes one AU from Alpha Centauri A.

A development build you can download: walk the captain around the bridge under the live relativistic sky, open the galaxy map from the nav console, and fly a journey to α Centauri A through the bubble. macOS only, Apple Silicon.

The ship has faces now. The captain is picked, the crew have proposed portraits, and the bridge stands in the engine over the live sky.

A new milestone, M5, brings planets, moons and flybys inside a star system, with the same rule as the sky: real data, real physics.