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New Study Suggests Earth May Have Generated Its Own Water

A recent study published in Nature Geoscience proposes that Earth may have created a significant portion of its water through chemical reactions during its formation, rather than relying solely on external sources like…

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Science · November 15, 2026
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Earth may have created a substantial amount of its own water as the planet was forming, rather than relying entirely on comets, meteorites, or other objects to deliver it from space. New research published in Nature Geoscience suggests that chemical reactions between rocky pebbles and the hydrogen-rich atmosphere of the young Earth could have produced enormous quantities of water (Source ID: 1). [1]

Researchers at The University of New Mexico investigated this possibility by recreating some of the extreme conditions that existed during Earth's formation. The study was led by graduate student Susmita Garai, along with Zachary Sharp, professor and director of Earth and Planetary Sciences, and Peter Olson. Their experiments examined what happens when rocks containing iron react with hydrogen at extremely high temperatures (Source ID: 1). [1]

Experiments Reveal Water Can Form in Minutes To determine whether this process could actually occur, the researchers exposed samples of silicate rock to temperatures ranging from 1,200 to 1,400 degrees Celsius. They conducted experiments using flowing hydrogen gas and repeated the tests with helium to provide a comparison. Each experiment ran for between 15 minutes and three hours (Source ID: 1). [1]

The results provided strong evidence that the proposed reaction works under these extreme conditions. When the rocks were heated in hydrogen, almost 80% of their iron oxide was transformed into metallic iron, with water vapor produced during the reaction. In contrast, the researchers did not observe the same reaction when helium was used instead of hydrogen (Source ID: 1). [1]

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New research published in Nature Geoscience suggests that chemical reactions between rocky pebbles and the hydrogen-rich atmosphere of the young Earth could have produced enormous quantities of water. This discovery offers a new explanation for how our planet acquired one of the most important ingredients for life. Researchers at The University of New Mexico investigated this possibility by recreating some of the extreme conditions that existed during Earth's formation (Source ID: 1). [1]

The study was led by graduate student Susmita Garai, along with Zachary Sharp, professor and director of Earth and Planetary Sciences, and Peter Olson. Their experiments examined what happens when rocks containing iron react with hydrogen at extremely high temperatures. Previous ideas about the source of water to Earth rely on an external source, such as comets or meteorites. Here we show that virtually any Earth-sized planet should have water by this newly identified mechanism (Source ID: 1). [1]

To determine whether this process could actually occur, the researchers exposed samples of silicate rock to temperatures ranging from 1,200 to 1,400 degrees Celsius. They conducted experiments using flowing hydrogen gas and repeated the tests with helium to provide a comparison. Each experiment ran for between 15 minutes and three hours. The results provided strong evidence that the proposed reaction works under these extreme conditions (Source ID: 1). [1]

New research published in Nature Geoscience suggests that chemical reactions between rocky pebbles and the hydrogen-rich atmosphere of the young Earth could have produced enormous quantities of water (1). The study was led by graduate student Susmita Garai, along with Zachary Sharp, professor and director of Earth and Planetary Sciences, and Peter Olson. To determine whether this process could actually occur, the researchers exposed samples of silicate rock to temperatures ranging from 1,200 to 1,400 degrees Celsius (1). [1]

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The experiments examined what happens when rocks containing iron react with hydrogen at extremely high temperatures. Previous ideas about the source of water to Earth rely on an external source, such as comets or meteorites. Here we show that virtually any Earth-sized planet should have water by this newly identified mechanism (1). In order to evaluate the possibility of 'pebble' rain' being a source of water, we needed to construct and execute some very challenging high-temperature experiments (1). [1]

The results provided strong evidence that the proposed reaction works under these extreme conditions. When the rocks were heated in hydrogen, almost 80% of their iron oxide was transformed into metallic iron, with water vapor produced during the reaction. In contrast, the researchers did not observe the same reaction when helium was used instead of hydrogen. This difference confirmed that hydrogen played a crucial role in generating the water (1). [1]

New research published in Nature Geoscience suggests that chemical reactions between rocky pebbles and the hydrogen-rich atmosphere of the young Earth could have produced enormous quantities of water (1). The study was led by graduate student Susmita Garai, along with Zachary Sharp, professor and director of Earth and Planetary Sciences, and Peter Olson. To determine whether this process could actually occur, the researchers exposed samples of silicate rock to temperatures ranging from 1,200 to 1,400 degrees Celsius (1). [1]

The experiments examined what happens when rocks containing iron react with hydrogen at extremely high temperatures. The results provided strong evidence that the proposed reaction works under these extreme conditions (1). When the rocks were heated in hydrogen, almost 80% of their iron oxide was transformed into metallic iron, with water vapor produced during the reaction (1). [1]

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In contrast, the researchers did not observe the same reaction when helium was used instead of hydrogen. This difference confirmed that hydrogen played a crucial role in generating the water (1). The speed and scale of the reaction were especially striking. Although the scientists had expected some water to form, the results suggested that the process could have been far more productive than anticipated (1). [1]

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