1. Scroll to zoom in and out. 2. Click and drag on space to scroll screen. 3. Click and drag on objects to move objects. 4. Click "NEW OBJECT" to add a new object with custome mass and volume. 5. Drag "gravity multiplier" slider to adjust the strength of gravity. Commands (type "/" to input command): gravity set <data> gravity change <data> position set <data> position change <data> velocity change <object ID> <x/y> <data> velocity set <object ID> <x/y> <data> commandloop create <name> commandloop edit <name> <line> <command> commandloop delete command <name> commandloop delete line <line> I plan on adding more commands in the future so you can even reprogram the simulation to your desire, but this is all for now.
This is a program that I made using REAL physics as the code. I didn't make up my own numbers; this program simulates space and gravity exactly 1:1. For this reason, objects need to be really large for gravity to be visible, so I added a gravity multiplier at the bottom to play around with. I also found that adding objects with 1000000000 kg of mass and 1 km^3 volume is around the sweet spot to play around with.