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  1. Galaxy Makers | Design your own Universe!

  2. NSTMF Gravity - National Science and Technology Medals …

  3. Create Galaxy

  4. Gravity Simulator | All Scenarios

  5. PlanetMaker

  6. Particle Sandbox - Gravity Simulator

  7. Celestia: Home

  8. Gravity and Orbits‬ - PhET Interactive Simulations

  9. Universe Sandbox

  10. Design your own Universe! - Galaxy Makers