Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [event-horizon]

An event horizon is the notion of a distance away from the gravitational center of mass of a black hole. Observers outside of the event horizon can escape however any object including light which approaches a black hole and crosses the event horizon cannot escape the gravitational pull and are consumed.

2
votes
1answer
105 views

Shouldn't we not be able to see some black holes?

Whenever there is a picture of a black hole, (even though they are artist depictions, this is how they are described) most are shown kind of in a flat disk like this. My question is, why do we see ...
0
votes
1answer
104 views

Need help with a simple Blackhole question

Suppose the amount of mass in a black hole doubles. Does the event horizon change? If so, how much does it change?
1
vote
1answer
79 views

Why is cosmological event horizon closer to us than the particle horizon?

From what I learned, cosmological event horizon is the horizon that moves away from us at/more than the speed of light. And particle horizon is the horizon that particles inside the horizon can have a ...
4
votes
2answers
147 views

Black Hole growth [duplicate]

The latest info on black holes with regard to their formation is that since space and time go to infinity at the event horizon, from an outside perspective nothing ever enters a black hole, and it ...
0
votes
2answers
68 views

Information Paradox with Hawking's Radiation

A theory about Blackholes storing the information from the universe. Being said that Blackholes are condensed mass sufficient enough to break every particle into different elementary particles, ...
3
votes
1answer
258 views

Would a future hole in the Cosmic Microwave Background show us the edge of the universe?

If my understanding is correct, the Cosmic Microwave Background always come from our event horizon. By event horizon I mean the edge of the observable universe. If the universe is finite does it mean ...
4
votes
1answer
129 views

Reshaping black holes to “push” the event horizon

I watched this simulation made by LIGO (Laser Interferometer Gravitational-Wave Observatory) where 2 black holes merge into one. https://www.youtube.com/watch?v=I_88S8DWbcU I was therefore thinking ...
1
vote
1answer
132 views

Is it possible to throw a camera attached to a rope within the event-horizon of a black hole and then pull it back in?

I have heard that when something passes the event-horizon of a black hole nothing can stop it from getting pulled in. Is that true for objects partially past the event-horizon? Would it be possible to ...
4
votes
2answers
160 views

How do we know that Singularity is not an object with reasonable radius?

So for example: a Neutron star has a radius of 10km and 2 solar masses. A singularity can have a radius of 1m and 10 solar masses, with a 1km event horizon radius. Basically it will just be a more ...
3
votes
1answer
164 views

Theoretical measure of distance to black hole?

Would it be possible to measure the distance to a black hole of known mass by measuring the radius of the most redshifted radiation that is detectable? The idea is that since the point where that ...
5
votes
1answer
286 views

Whats the deal with black holes and “no information from inside the event horizon can leave”?

I don't know if this would fall under the other questions but I have always been confused by this... Information has left the black hole; its mass, rotation, location, and a few other properties. My ...
5
votes
1answer
180 views

Why do “they” portray colliding black holes like that?

When I see an animation of two colliding black holes anywhere, it looks like two merging beads of water. But why would the event horizon form a bridge during collision? There is no material flowing in-...