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How to explore Galilean Moons 3D Explorer

Open the Galilean Moons 3D Explorer, watch the four moons orbit Jupiter with true period ratios, and click each moon to read NASA JPL periods and diameters.

  1. Open https://freetoolonline.com/space-3d/galilean-moons.html and wait for Jupiter plus four colored moons and orbit rings to paint.
  2. Click Io first - period 1.769 days, diameter about 3,643 km - then Europa (3.551 d) to see the near 2:1 timing.
  3. Click Ganymede (7.155 d, largest moon) and confirm it is about 4x Io's period - the Laplace chain.
  4. Click Callisto (16.689 d) farther out - not locked into the 4:2:1 resonance.
  5. Press Pause orbits to freeze spacing, then Overview table to compare all four rows at once.

Next: the when guide or vs alternatives. Open the Galilean Moons 3D Explorer.

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