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the claim

There is a Planet Nine in the outer solar system.

the verdict
REFUTED
the evidence says no
Recorded sources
2 sources for · 4 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 there is a Planet Nine in the outer solar system?

No. NASA states that Planet Nine has not been discovered and remains theoretical, with debate over whether it exists. Other sources treat it as a hypothesis, and one study concludes its existence is unlikely.

Verdict: REFUTED · 2 sources for, 4 against · Last checked

Evidence for · 2
MAKING PLANET NINE: A SCATTERED GIANT IN THE OUTER SOLAR SYSTEM
2016
Get citation
Bromley, B. C. & Kenyon, S. J. (2016). MAKING PLANET NINE: A SCATTERED GIANT IN THE OUTER SOLAR SYSTEM. doi.org. https://doi.org/10.3847/0004-637x/826/1/64

Evidence against · 4
Planet Nine
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Planet Nine. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Planet_Nine

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More for · 1
OBSERVATIONAL CONSTRAINTS ON THE ORBIT AND LOCATION OF PLANET NINE IN THE OUTER SOLAR SYSTEM
2016
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Brown, M. E. & Batygin, K. (2016). OBSERVATIONAL CONSTRAINTS ON THE ORBIT AND LOCATION OF PLANET NINE IN THE OUTER SOLAR SYSTEM. doi.org. https://doi.org/10.3847/2041-8205/824/2/l23

More against · 3
Orbital Precession in the Distant Solar System: Further Constraining the Planet Nine Hypothesis with Numerical Simulations
2020
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Orbital Precession in the Distant Solar System: Further Constraining the Planet Nine Hypothesis with Numerical Simulations. (2020). doi.org. https://doi.org/10.3847/1538-3881/ab9227

Why hasn't the "9th Planet" been detected already?
Get citation
Why hasn't the "9th Planet" been detected already?. (n.d.). astronomy.stackexchange.com. https://astronomy.stackexchange.com/questions/13330

Hypothetical Planet X
Get citation
Hypothetical Planet X. (n.d.). science.nasa.gov. https://science.nasa.gov/solar-system/planet-x/

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