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### Do you see the outside world from inside the black hole (can you see past the horizon from inside it)? [duplicate]

I have read these questions: If you fall in a black hole, when do you go past the event horizon? Can matter really fall through an event horizon? How can anything ever fall into a black hole as ...
40 views

### Does a person falling into a black hole “see” the black hole? [duplicate]

For a person not falling into a black hole they must be accelerating. They will see a black hole event horizon with Hawking radiation coming out of it. For a free-falling person falling into a black ...
28 views

### if somehow we could survive in black hole would we survive the end of universe as time inside black hole would stop and would be infinite? [duplicate]

as time goes on slowing with increase in mass. how can black hole ever form in finite time. is infinite time has different meaning for different observer. if so would the event of universe dying be ...
26k views

### Does someone falling into a black hole see the end of the universe?

This question was prompted by Can matter really fall through an event horizon?. Notoriously, if you calculate the Schwarzschild coordinate time for anything, matter or light, to reach the event ...
6k views

### What is the definition of a timelike and spacelike singularity?

What is the definition of a timelike and spacelike singularity? Trying to find, but haven't yet, what the definitions are.
296 views

### Consequences of infinite redshift in the event horizon of a Schwarzschild black hole

I am familiar with the usual derivation of the fact that it is impossible for someone to observe an object enter a black hole, because of the fact that light gets infinitely redshifted as its source ...
334 views

### What Would a White Hole Look Like?

I know it is merely hypothetical, but I am rather curious about what would it look like if it was real. For instance: a Black hole: that would have a 100% black sphere, called the event horizon ...
152 views

### Bob sees Alice never reaching the event horizon. What does Alice see when looking at Bob?

Alice is in a rocket hovering outside a BH event horizon when her rocket runs out of fuel, and thus begins a free-fall decent. Bob is also in an inertial frame but at a very large distance. It is ...
160 views

### Communication near a black hole

One ship is in a stable orbit outside of the event horizon of a very large black hole so that there is significant time dilation. Another ship is in its own orbit around the same black hole, but at a ...
118 views

### Would a Schwarzschild black hole “appear” to be a sphere in all reference frames?

I am wondering if all observers would agree that a non-rotating, non-charged black hole is spherical (i.e. there is no reference frame where one would measure it to be oblong in one dimension). I ...
Equation of motion for photon $$\Sigma \frac{dt}{d\lambda} = aL\left(1-\frac{r^2+a^2}{\Delta}\right) + \omega\left(\frac{\left(r^2+a^2\right)^2}{\Delta}-a^2 \sin ^2\theta\right)\ ,$$  \Sigma\frac{...