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Asked by cast520tosh to Kirsty L on 2 Oct 2024.
Question: Is a black hole a 2D or a 3D object?
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Kirsty Lindsay answered on 2 Oct 2024:
I don’t know, but NSA kids has a cool video here: https://spaceplace.nasa.gov/black-holes/en/
Comments
Martin M commented on :
At the centre of a black hole lies what is called a singularity. A point with zero dimensions!
Steve P commented on :
There’re at least 2 different aspects to consider here, the first (as per Martin’s comment above) is the dimensionless singularity (perhaps consider this to be a puncture in space-time). The second is what is normally considered the ‘edge’ of the black hole which is the ‘event horizon’ – effectively a border between the visible universe and a spherical zone around the singularity from which nothing can escape (not even light). (Lets leave aside Hawking radiation at this point). The event horizon surrounding a black hole is a 3D sphere.
Sheridan commented on :
Could even be a 4D object as time comes into it! Some theorists say it could link dimensions.