Galaxy from real orbital physics

The author presents this one-sentence GPT-6 Astra prompt as their input for a deterministic galaxy simulation and a 30-second flight through it. It requests real orbital physics and 320,000 stars.

Prompt optimization tips

1

Specify editability

State which objects must remain separate, named and editable; otherwise a visually convincing shell may still be unusable.

2

Close the test loop

Ask the model to run the scene, inspect visible failures and repeat until concrete frame-rate, interaction and layout checks pass.

3

Stage long builds

For large worlds, split the work into districts, assemblies or milestones and approve each section before expanding scope.

Imagine It. Shape It.