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the claim

Long-period comets come from the Oort cloud.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
11 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Long-period comets come from the Oort cloud?

Yes. Multiple reference and peer-reviewed sources state that long-period comets originate from the Oort cloud, including NASA's Oort Cloud facts page and Wikipedia's Oort cloud article. Several research papers describe long-period comets as coming from the Oort cloud, though some phrase it as a hypothesis.

Verdict: SUPPORTED · 11 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 11
Oort cloud - Wikipedia
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Oort cloud - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Oort_cloud

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More for · 10
The Oort Cloud and long‐period comets
2013
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Rickman, H. (2013). The Oort Cloud and long‐period comets. doi.org. https://doi.org/10.1111/maps.12080

What long-period comets tell us about the Oort Cloud
2023
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Fouchard, M., Higuchi, A., & Ito, T. (2023). What long-period comets tell us about the Oort Cloud. doi.org. https://doi.org/10.1051/0004-6361/202243728

The Demographics of Long-Period Comets
2005
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Francis, P. J. (2005). The Demographics of Long-Period Comets. arxiv.org. https://doi.org/10.1086/497684

Reassessing the Source of Long-Period Comets
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Reassessing the Source of Long-Period Comets. (n.d.). cir.nii.ac.jp. https://doi.org/10.1126/science.1172676

2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud
2009
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Kaib, N. A., Becker, A. C., Jones, R. L., Puckett, A. W., Bizyaev, D., Dilday, B., Frieman, J. A., Oravetz, D. J., Pan, K., Quinn, T., Schneider, D. P., & Watters, S. (2009). 2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud. arxiv.org. https://doi.org/10.1088/0004-637X/695/1/268

Anisotropy of Long-period Comets Explained by Their Formation Process
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Anisotropy of Long-period Comets Explained by Their Formation Process. (n.d.). cir.nii.ac.jp. https://doi.org/10.3847/1538-3881/aba94d

Distribution of long-period comets: comparison between simulations and observations
2017
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Distribution of long-period comets: comparison between simulations and observations. (2017). hal.science. https://doi.org/10.1051/0004-6361/201630343

Combined Long-term Orbital and Thermal Evolution Simulations of Oort Cloud Comets
2025
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Parhi, A. & Prialnik, D. (2025). Combined Long-term Orbital and Thermal Evolution Simulations of Oort Cloud Comets. doi.org. https://doi.org/10.5194/epsc-dps2025-388

Oort Cloud: Facts - NASA Science
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Oort Cloud: Facts - NASA Science. (n.d.). science.nasa.gov. https://science.nasa.gov/solar-system/oort-cloud/facts/

Radio observations of Jupiter-family comets
2008
Get citation
Crovisier, J., Biver, N., Bockelée-Morvan, D., & Colom, P. (2008). Radio observations of Jupiter-family comets. archive.org. https://archive.org/details/arxiv-0808.3843

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