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the claim

The event horizon is the boundary of a black hole.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
10 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 the event horizon is the boundary of a black hole?

Yes. Multiple reference sources state directly that the event horizon is the boundary of a black hole, including a textbook definition and an almanac entry using the claim's exact wording. Other physics sources treat the event horizon as a black hole feature without contradicting that definition.

Verdict: SUPPORTED · 10 sources for, 0 against · Last checked

Evidence for · 10
Event horizon
Get citation
Event horizon. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Event_horizon

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More for · 9
What's the difference between the apparent horizon and event horizon of a black hole?
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What's the difference between the apparent horizon and event horizon of a black hole?. (n.d.). astronomy.stackexchange.com. https://astronomy.stackexchange.com/questions/12599

Event Horizon Image within Black Hole Shadow
2019
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I., D. V. & O., N. N. (2019). Event Horizon Image within Black Hole Shadow. inis.iaea.org. https://inis.iaea.org/records/bmx3r-sdv47

The Jet-disk Boundary Layer in Black Hole Accretion
2021
Get citation
N., W. G., Yufeng, D., & S., P. B. (2021). The Jet-disk Boundary Layer in Black Hole Accretion. authors.library.caltech.edu. https://doi.org/10.3847/1538-4357/abf8b8

BOUNDARY UNITARITY AND THE BLACK HOLE INFORMATION PARADOX
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BOUNDARY UNITARITY AND THE BLACK HOLE INFORMATION PARADOX. (n.d.). cir.nii.ac.jp. https://doi.org/10.1142/s0218271813420029

Are black holes bound to merge once their event horizons touch?
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Are black holes bound to merge once their event horizons touch?. (n.d.). physics.stackexchange.com. https://physics.stackexchange.com/questions/503836

Is it possible the space-time manifold itself could stop at a black hole's event horizon?
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Is it possible the space-time manifold itself could stop at a black hole's event horizon?. (n.d.). physics.stackexchange.com. https://physics.stackexchange.com/questions/394062

Horizon-penetrating transonic accretion discs around rotating black holes
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Horizon-penetrating transonic accretion discs around rotating black holes. (n.d.). cir.nii.ac.jp. https://doi.org/10.1111/j.1365-2966.2007.11877.x

Space almanac
1992
Get citation
1940-, C. A. R. (1992). Space almanac. archive.org. https://archive.org/details/spacealmanac0000curt

Space almanac
Get citation
1940-2015, C. A. R. (n.d.). Space almanac. archive.org. https://archive.org/details/isbn_9780884150398

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