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How to Explore Moon Formation Giant Impact 3D Explorer

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Open the Moon Formation Giant Impact 3D Explorer, step through the five stages from before impact to present-day orbit, and click each body for its facts.

  1. Open https://freetoolonline.com/space-3d/moon-formation-giant-impact.html and wait for proto-Earth and Theia to paint at stage 0.
  2. Click Theia (the smaller, reddish sphere) - a Mars-sized protoplanet holding about 10% of Earth's mass in the canonical model.
  3. Drag the stage slider to 1 (Impact) and see Theia close in at an oblique angle of roughly 45 degrees.
  4. Drag the stage slider to 2 (Debris disk) and watch the ejected-material ring appear around Earth.
  5. Drag the stage slider to 4 (Present-day orbit) and click the Moon for its current distance and size.

Moon formation key figures

QuantityValue
Theia mass (canonical model)~10% of Earth's
Impact time~4.5 billion years ago
Moon diameter today~3,474 km

Next: the when guide or vs alternatives. Open the Moon Formation Giant Impact 3D Explorer.

Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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