Scientists have found evidence that water is escaping from Earth's core, using hydrogen isotopes as the key signal, according to Science | AAAS. The outlet reported the finding on Friday, October 9, 2026.
The report centers on hydrogen isotopes, variants of the element that carry different numbers of neutrons. Their ratios act as a fingerprint, and Science | AAAS reports that these isotopic signatures point to water moving out of the core rather than staying locked inside it.
That matters because the core has long been treated as largely isolated from the surface. Water at that depth would not be expected to migrate upward easily. The new work, as described by Science | AAAS, challenges that assumption by tying the isotope evidence directly to a leakage process.
The summary released by the publisher does not include the full article text, so details such as the specific isotope measurements, the research team, or the timescale involved are not yet available from the material provided. What is clear is the central claim: hydrogen isotopes are being read as a marker of water leaving the core.
Because the finding rests on isotopic ratios, follow-up work will likely focus on how those measurements were obtained and whether other research groups can reproduce them. For now, the takeaway is narrow and specific — a hydrogen isotope signal that Science | AAAS says indicates water is leaking from Earth's core.
Watch for the full study and independent reactions from geochemists, which should clarify how much water is involved and over what period.
