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Does an infalling observer ever cross the black hole event horizon in finite proper time?

First, thank you for the research and comprehensive answer. By “seeing a distance” I describe colloquially how two nearby spaceships would measure their distance: they could use light signals or even ...
Zweistein's user avatar
18 votes

Stellar Mass Black Holes and the companion star dynamics

An isolated (stellar mass) black hole is not expected to produce electromagnetic signals of note. The only way we are likely (used in a very loose sense) to observe them is through micro lensing ...
TimRias's user avatar
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3 votes

Does an infalling observer ever cross the black hole event horizon in finite proper time?

Forget observer C, you seem to understand their scenario and situation. For two observers falling (freely) into a black hole (A first, B following), one after the other, then indeed B can never ...
ProfRob's user avatar
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16 votes

Evolution of black holes. Could they lose mass faster than the Hawking radiation?

The nearby supermassive black holes are (on average) bigger than the distant ones. Of course there are more distant galaxies than nearby ones, so the largest black holes tend to be in fairly distant ...
James K's user avatar
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Black Hole Photon Ring

Here I delve into the involved mechanics to define what is meant by a photon that's almost trapped. Imagine a photon approaching a black hole from distant space, but not directly in line with the (...
Oscar Lanzi's user avatar
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3 votes

Black Hole Photon Ring

I think you may be confusing two distinct concepts (though I can fully understand why). Photon rings on a black hole are a visual effect, visible from a distance, caused by inbound photons making (...
Darth Pseudonym's user avatar
2 votes
Accepted

Does nucleosynthesis such as R Process, S Process, and P process occur in relativistic jets?

Your linked article is about relativistic jets internal to collapsing stars, where the density is high enough for nucleosynthesis to proceed. This cannot be observed directly. Without such ...
John Doty's user avatar
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5 votes

Black Hole Photon Ring

It's not the photons caught in the ring that you are seeing in that simulation, but think about all the photons that don't quite get caught by the ring. They will be significantly diverted around the ...
Rory Alsop's user avatar
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8 votes

Why are black holes oblate spheroids?

By your logic that the gravity is infinite, you could equally ask how can a non-spinning black hole be a sphere rather than a point? The answer is that the surfaces you are discussing are not the ...
ProfRob's user avatar
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2 votes
Accepted

Does a relativistic jet contain dust particles?

Theoretically, Yes. Relativistic jets accelerate beams of plasma, so due ionization it has a lack of baryonic matter as @Uhoh pointed, instead it contains a lot of leptons and antileptons like ...
Arjun's user avatar
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