Life & fun · December 29, 2025
A solar system simulation in the browser
I didn't realize Universe Sandbox ran on MacOS, and I was in the mood to play around a bit. Some functions it's got: - Random system generation - Sonification is super fun too - Habitability Simulation (Just for fun, don't cite this please) - Replacing, spawning, deleting objects I've had tons of fun building this, so I hope someone else can share the joy. It's free and runs in the browser. I'd love to hear any feedback. I think this is at a state where I might leave it as it is, but if people are interested in other features, maybe I'll keep working on it. I've kept saying I'll stop working…
A solar system simulation in the browser launched on December 29, 2025 with 13 votes, #712 of 11,628 launches that month and more than 75% of that year's launches.
In plain words
This browser-based solar system simulation lets users generate, explore, and manipulate virtual star systems. Features include random system generation, object creation and deletion, habitability simulation, and sonification that converts celestial data into sound. Designed for anyone interested in astronomy and interactive space exploration, it runs entirely in the browser at no cost. The tool emphasizes playful experimentation over scientific accuracy.
written from the facts on this page · September 2026
From the sources
Build and break solar systems with real N-body gravity in your browser. Fly rockets, and see why Earth
Educators: if you use Luna in a classroom or lecture hall, a few sentences from you would help me get funding to build out Luna's teaching tools. It costs you nothing, and you'd have a say in what gets built. Get in touch with your name, institution, and how you use it. Luna simulates the Solar System with full N-body gravity: every star, planet, and major moon pulls on every other. Drop a second Jupiter next to Earth, or crank up the Sun's mass, and every orbit responds in real time. There's also Rocket Academy for building and staging rockets until one reaches orbit, and a scattering playground where mixing atmospheric gases shows why Earth's sky is blue and Mars's is butterscotch. You…from luna.watermelonson.com
In the maker’s words, at launch
I didn't realize Universe Sandbox ran on MacOS, and I was in the mood to play around a bit. Some functions it's got: - Random system generation - Sonification is super fun too - Habitability Simulation (Just for fun, don't cite this please) - Replacing, spawning, deleting objects I've had tons of fun building this…
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