Collect starlight. Process data. Catalog the cosmos.
Run a growing observatory from a hilltop refractor to galactic-scale arrays. Tap to observe, buy equipment, ride the day/night cycle, and unlock deeper facility tiers as your sky catalog fills with real astronomy targets.
Play free in your browser — no download required. First load is ~40 MB, so give it 30–60 seconds; after that your progress saves locally.
Starlight, data, and discoveries flow as three production chains that feed each other.
Starlight yield drops in daylight; upgrades and prestige help you push through.
25 named deep-sky targets, each with a short astronomy blurb and a permanent bonus.
Hilltop Site → Radio Wing → Space Network → Deep Field Array.
Dark-Sky Rating (run reset) and Galactic Mandate (meta reset) for endless scaling.
Telescopes, correlators, orbital platforms, Mandala Arrays, and more.
Click power, global output, daylight resistance, and producer discounts.
Nightly observation goals and scaling research contracts from the Director.
Clouds, comets, and transients keep the night sky alive.
Track milestones from First Light to Master Cartographer.
Keep earning while away — up to 24 hours.
Local autosave, backup, export/import, and STELLAR1: cloud save codes.
A built-in tutorial walks you through the basics. Works with mouse or touch, in a portrait-oriented UI that's comfortable on phone browsers and desktop alike.
Patch notes and updates, newest first.
Stellar Observatory begins rolling out on Google Play (com.stellarobservatory.game) with optional rewarded ads, in-app Supporter Pack and Stellar Credit packs, and optional Play Games cloud backup. Fixes the first-run tutorial touch input on Android with larger tap targets and dimmed modal steps. Saves from 0.5.0 carry forward; itch and Play builds share the same game logic.
The biggest economy and interface pass since launch. Reorganized equipment shop with tier headers and multi-currency buys, scalable research contracts, a dedicated Settings panel (with a 75–150% UI size slider), and a redesigned Journal for stats and achievements. The first Dark-Sky prestige is tuned for a ~30-minute fresh run. Saves from 0.4.x upgrade automatically.
A polish and performance pass. Adds rare comet events you can tap for bonus resources, relaxing background music that crossfades with the day/night cycle, and a browser performance mode (reduced sky effects, throttled shop refreshes) that's on by default on the web. Also adds an optional FPS counter and fixes a save bug that could zero out current starlight on load.
The hilltop refractor was never going to run itself. v0.3.0 adds a whole "what do we point at tonight?" layer on top of the idle loop — the Director's Office, observation programs, and staff assignment, giving you meaningful nightly decisions alongside the steady incremental climb.
The full privacy policy covering the browser, itch.io Android, and Google Play builds — what's stored on your device, optional ads and purchases, and cloud backup. Read the privacy policy →
Step-by-step instructions for deleting your data across local saves, cloud codes, Play backups, purchases, and advertising IDs. Read the data deletion steps →
Full original devlogs live on itch.io.
Play instantly in your browser, or grab the Windows and Android builds from itch.io.