The ability to create your own planets and share them with other players on SimpleRockets.com.
- Include an editor where players can tweak the procedural generation and control the overall look of the planet.
- Adjust planet radius, surface gravity, sea level (if it has water), and rotation speed.
- Adjust atmosphere parameters such as density, wavelength, etc.
- Build solar systems using their planets (or other players' planets) and adjust their orbital parameters. For example, they could easily make a solar system with an Earth-like planet orbiting a gas giant.