# Where Did Earths Water Come From? ETH Zurich Just Ruled Out the Obvious Answer

- slug: where-did-earths-water-come-from-eth-zurich-just-ruled-out-the-obvious-answer
- date: 2026-04-07
- category: Space & Aerospace

Less than 2% of Earth came from beyond Jupiter. That undercuts the leading theory for how our oceans arrived. The researchers who ran the numbers cannot yet explain where the water actually came from.

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