Stellar Observatory Idle

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.

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Play in your browser above — no download required.

First load: the browser build is ~40 MB. Give it 30–60 seconds on a typical connection. After that, progress saves locally in your browser.

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How to play

1. Observe the sky to gather starlight
2. Buy Telescopes, Photometers, and Grad Students in the shop
3. Convert starlight into Data and Discoveries
4. Fill the Sky Catalog (25 real objects — from Andromeda to GW170817)
5. Prestige to a darker site for permanent bonuses, then charter the Galactic Network for endgame scaling

Built-in tutorial walks you through the basics. Works with mouse or touch.

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Features

• Idle / incremental loop — starlight, data, and discoveries as three production chains
• Day / night cycle — starlight yield drops during daylight; upgrades and prestige help you push through
• Sky catalog — 25 named deep-sky targets, each with a short astronomy blurb and a permanent bonus
• Facility tiers — Hilltop Site, Radio Wing, Space Network, Deep Field Array
• Two prestige layers — Dark-Sky Rating (run reset) and Galactic Mandate (meta reset)
• 24+ producers — telescopes, correlators, orbital platforms, Mandala Arrays, and more
• Research upgrades — click power, global output, daylight resistance, producer discounts
• Observation programs & contracts — nightly goals and research contracts
• Sky events — clouds, comets, and transients
• Achievements and journal — track milestones from First Light to Master Cartographer
• Offline progress — earn while away (up to 24 hours)
• Save tools — local autosave, backup, export/import, and cloud save codes
• Ambient audio — day/night soundscapes and UI feedback
• Accessibility — UI and text size sliders in Settings

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Facility progression

• Hilltop Site — available from the start
• Radio Wing — 500 lifetime discoveries
• Space Network — Dark-Sky Rating 3
• Deep Field Array — Galactic Mandate 1

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Controls

• Click / tap — observe, buy, navigate tabs
• Shop tabs — Equipment, Research, Catalog, Dark-Sky, Galactic
• Journal — stats and achievements
• Settings (gear icon) — display, audio, save management, supporter edition

Portrait-oriented UI — comfortable on phone browsers and desktop.

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Save data

Progress is stored locally on your device (browser storage or app data). Clearing site data or uninstalling removes your save. Use export / cloud save codes in Settings to back up or move between devices.

Request data deletion (Google Play players — optional Google cloud backup is covered there too).

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Version 0.5.1

• Equipment economy overhaul and shop buy-flow improvements
• Research contracts, comet events, observation programs
• Settings menu (display, saves, supporter edition) split from Journal
• UI and text size sliders
• Cloud save codes, backup, and export/import
• Balance and tutorial polish

Made with Godot 4.6. Feedback, ratings, and comments are very welcome — they help more players find the game.

Stellar Observatory is a fan-made idle game with an astronomy theme. Celestial object names and descriptions are inspired by real targets; this is not an educational or scientific simulation.