[Qauunet]

Yup...the only thing i can think of that would emerge from the otherside of a blackhole is just particles of the previous objects which entered it

Other side of a black hole?

[Plulpangepler]

If the blackhole was big enough, you could actually survive beyond the event horizon (of course you could not communicate outside it).

The time/space distortion gets spread out as it gets bigger, and if its really big the difference over 1-2m would not be big enough to kill you.

[DenisLevvin]

If the blackhole was big enough, you could actually survive beyond the event horizon (of course you could not communicate outside it).

The time/space distortion gets spread out as it gets bigger, and if its really big the difference over 1-2m would not be big enough to kill you.

The radiation would kill you would it not?

[wpFWNoIt]

Does anyone know how big a singularity actually is?

[isopsmypovA]

If the blackhole was big enough, you could actually survive beyond the event horizon (of course you could not communicate outside it).

The time/space distortion gets spread out as it gets bigger, and if its really big the difference over 1-2m would not be big enough to kill you.

Really?! That is very interesting. So if you had like the "right" equipment as an astronaut you could research the hole? :P

But how are you going to escape? :S

[CurtisTH]

The radiation would kill you would it not?

If you're referring to Hawking radiation, the answer is no - it's incredibly low level. However, if you're referring to the X-ray or gamma radiation emitted by the accretion disc that can be found around many black holes, then you'd be alright as long as you kept out of the path of the radiation jets (which are highly directional).

Does anyone know how big a singularity actually is?

By it's very definition, it's point-sized.

Really?! That is very interesting. So if you had like the "right" equipment as an astronaut you could research the hole? :P

But how are you going to escape? :S

What Meaker is saying is that the gradient of the gravitational field at the event horizon of a massive black hole is very gentle - think in terms of geometry: the smaller the circle is, the tighter the circumference is, and vice versa. Hence why the Earth looks flat to us because the radius is huge compared to us. A massive black hole has a very large event horizon radius, the "gravity circumference" is nice and easy-going... so much so, that one could pass through it and feel nothing odd. However, time dilation effects would be extremely noticeable so it's not like you could pass through the event horizon and not be aware of it.

Anyway, once past the horizon, you're stuff - no amount of rocket thrust or velocity will get you back out again.

[Pszinygv]

Anyway, once past the horizon, you're stuff - no amount of rocket thrust or velocity will get you back out again.

Could i take this into the theoretical realm for a moment? If you could somehow generate your own gravitational forces, could you offset the effect of the black holes gravity? I'm not sure i'm making sense, but in the same way a planet orbits the Sun, if your craft could create sufficient gravity to offset that of the black hole and then sufficient velocity to shift the craft at very high speed, could you not get in very close orbit to a black hole, perhaps passing over the event horizon, close to the centre and slingshot out again? Silly thought probably, but it just kind of popped in there. [rofl]

[wpFWNoIt]

Is it wrong for my brain to hurt? Im off to watch the next generation, they explained a little better

[wpFWNoIt]

By it's very definition, it's point-sized.

[surrender]suppose you need one hell of an imagination to understand the cosmos

[RgtrsKfR]

Could i take this into the theoretical realm for a moment? If you could somehow generate your own gravitational forces, could you offset the effect of the black holes gravity? I'm not sure i'm making sense, but in the same way a planet orbits the Sun, if your craft could create sufficient gravity to offset that of the black hole and then sufficient velocity to shift the craft at very high speed, could you not get in very close orbit to a black hole, perhaps passing over the event horizon, close to the centre and slingshot out again? Silly thought probably, but it just kind of popped in there. [rofl]

When a massless photon can't escape the Black Hole, a spacecraft surely couldn't either. To be even with the photon the craft would need all the energy of the Universe and it still wouldn't be enough. Remember that we were discussing a free fall to the Black Hole, fighting against its gravitation field with any remarkable counterforce would just end in splatting the craft and the astronaut. [yes]

[CurtisTH]

Could i take this into the theoretical realm for a moment? If you could somehow generate your own gravitational forces, could you offset the effect of the black holes gravity?

Anything that has mass (inertial or otherwise) generates gravity, so you already do it - it's just that the "amount of gravity" you generate is directly proportional to your mass, hence why your own gravity is barely noticeable compared to the likes of that generated by a planet. However, I assume that you're talking about making extra gravity, like in Star Trek...

suppose you need one hell of an imagination to understand the cosmos

There's a common phrase amongst particle physicists, cosmologists, quantum physicists, etc:

"Sod what it actually means, just do the maths"

A lot of what the modelling generates has no simple or even physical visualisation to it, so it's best not to worry about it, and this is very true for singularities: theoretically modelling them with mathematics is fine but trying to picture what one is like is pointless because there is no physical description for one.

[Alupleintilla]

Unfortunately not - think of space being like a sheet of rubber and the black hole is like a very heavy ball of iron placed on to it. The rubber will deform and create a deep pit with very steep sides: it's the steepness that's the problem.

Dr. Evanson,

Do you recall who made that rubber mat analogy popular? It is a good one, but I forget where I heard it before.

[DoctorQuquriramba]

I'd love to watch the videos posted but youtube is ****ing worthless

[sandracuk]

so let me get this right...

If one was to dip ones winky in the event horizon it would get stretched ?

[CurtisTH]

Do you recall who made that rubber mat analogy popular? It is a good one, but I forget where I heard it before.

Schwarzschild, I think - the correct name for the analogy is a hyperspace embedding diagram, though.

[wpFWNoIt]

Here's a wild speculation.........

Its been theorized that the universe is expanding at an accelerating rate because.... well, there are a few possibilities, but one is that there is a repulsive force that is growing stronger and stronger over time, possibly reaching a point in a surprisingly short (compared to the lifetime of the universe that was postulated before this) time.

Its theorized that this repulsive force might even eventually reach the point when the remaining Stars and Planets and in fact anything material are torn apart as atoms themselves became repulsed from one another.....

Would there be any black holes remaining in that far distant time? And does there ever become a point where the gravity of the holes becomes so low, due to the changing conditions, that the trapped/captured matter starts to.... be released? (or something)

What might that do?

Or is there a hole in the "whole" idea big enough to toss the Death Star through?

Edit: Interesting. It appears I am not the first person who has thought of this. Damn! (I thought I was being so clever)

But I can't seem to find an answer to the question!.......

[engideNedmupe]

Unfortunately not - think of space being like a sheet of rubber and the black hole is like a very heavy ball of iron placed on to it. The rubber will deform and create a deep pit with very steep sides: it's the steepness that's the problem. "Inside" the event horizon, the steepness is so much that you'd need to have a velocity greater than the speed of light to climb up and that's not possible if you have mass. If you generate your own gravity, however much you make, then you're just going to contribute to make the pit's sides steeper.

That said, it's only an issue inside the event horizon: beyond it, the velocity needed is always going to be less than the speed of light so, with enough speed, it's possible to come right up to the event horizon - within millimetres - and still get away. Any part of you or the spaceship that you're in that touches the event horizon has had it though.

So, looks like it's "Ask a physicist" time.

I will put forward this: What happens to the event horizons (specifically their radii) when those of 2 blackholes cross one another?

[wpFWNoIt]

so let me get this right...

If one was to dip ones winky in the event horizon it would get stretched ?

Trust you to bring the conversation down[rolleyes]

[Plulpangepler]

So, looks like it's "Ask a physicist" time.

I will put forward this: What happens to the event horizons (specifically their radii) when those of 2 blackholes cross one another?

After or durung?

[engideNedmupe]

After or durung?

When the event horizons first collide with eachother.