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the claim
Asteroids delivered most of Earth's water.
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SUPPORTED
the evidence backs this
Recorded sources
8 sources for · 3 against
Is it true that asteroids delivered most of Earth's water?
Yes. Two reference sources state that asteroids are the most likely primary source of Earth's water, with carbonaceous chondrite isotopes matching seawater. Other items support asteroid delivery in part or propose alternative or non-impact mechanisms, but none quantifies a majority against the claim.
Verdict: SUPPORTED · 8 sources for, 3 against · Last checked
Evidence for · 8
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Origin of water on Earth. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Origin_of_water_on_Earth
Evidence against · 3
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Vattuone, L. (2025). Adsorption of water on olivine and the origin of Earth's water. zenodo.org. https://doi.org/10.5281/zenodo.17108849
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More for · 7
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Martin, R. G. & Livio, M. (2021). How much water was delivered from the asteroid belt to the Earth after its formation?. arxiv.org. https://doi.org/10.1093/mnrasl/slab062
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Origin of Earth's water: sources and constraints. (2020). hal.science. https://hal.science/hal-02998047v1
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Meteorites Brought Water To Earth During the First Two Million Years | News | Astrobiology. (n.d.). astrobiology.nasa.gov. https://astrobiology.nasa.gov/news/meteorites-brought-water-to-earth-during-the-first-two-million-years/
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(NTRS), N. T. R. S. (2017). NASA Technical Reports Server (NTRS) 20170007505: PHYS: Division of Physical Chemistry 258 - Properties and Origins of Cometary and Asteroidal Organic Matter Delivered to the Early Earth. archive.org. https://archive.org/details/NASA_NTRS_Archive_20170007505
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Detection of Molecular H2O on Nominally Anhydrous Asteroids. (n.d.). iopscience.iop.org. https://iopscience.iop.org/article/10.3847/PSJ/ad18b8/pdf
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LibreTexts: 8.02%3A Atmosphere of the Earth. (n.d.). phys.libretexts.org. https://phys.libretexts.org/Courses/HACC_Central_Pennsylvania's_Community_College/Astronomy_103%3A_Introduction_to_Planetary_Astronomy/08%3A_The_Earth-Moon_System/8.02%3A_Atmosphere_of_the_Earth
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I., L. J., John, C., & Alessandro, M. (2003). The origin of water on Mars. authors.library.caltech.edu. https://doi.org/10.1016/s0019-1035(03)00172-6
More against · 2
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Kral, Q., Huet, P., Bergez-Casalou, C., Thébault, P., Charnoz, S., & Fornasier, S. (2024). An impact-free mechanism to deliver water to terrestrial planets and exoplanets. arxiv.org. https://doi.org/10.1051/0004-6361/202451263
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Earth's water may have been inherited from material similar to enstatite chondrite meteorites. (2020). hal.science. https://doi.org/10.1126/science.aba1948
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