What is the end-point of a black hole?

[Schadenfroh]

Read up on the FarScape project.

http://en.wikipedia.org/wiki/Farscape

 

[YOyoYOhowsDAjello]

CAT: So, what is it?
KRYTEN: I've never seen one before -- no one has -- but I'm guessing it's
a white hole.
RIMMER: A _white_ hole?
KRYTEN: Every action has an equal and opposite reaction. A black hole
sucks time and matter out of the universe: a white hole returns it.
LISTER: So, that thing's spewing time back into the universe? (He dons
his fur-lined hat.)
KRYTEN: Precisely. That's why we're experiencing these curious time
phenomena on board.
CAT: So, what is it?
KRYTEN: I've never seen one before -- no one has -- but I'm guessing it's
a white hole.
RIMMER: A _white_ hole?
KRYTEN: Every action has an equal and opposite reaction. A black hole
sucks time and matter out of the universe: a white hole returns it.
LISTER: (Minus the hat.) So, that thing's spewing time back into the
universe? (He dons his fur-lined hat, again.)
KRYTEN: Precisely. That's why we're experiencing these curious time
phenomena on board.
LISTER: What time phenomena?
KRYTEN: Like just then, when time repeated itself.
CAT: So, what is it?

They all stare at him.

CAT: Only joking.
LISTER: (Suddenly upright, and minus his hat, again) Okay, so it's
decided then. We consult Holly.
CAT: Hey, wait a minute -- I missed the discussion!
RIMMER: (Suddenly on the bench, where the CAT used to be sitting) We all
did.
KRYTEN: (Suddenly on the table previously occupied by LISTER) Time is
occurring in random pockets. The laws of causality no longer apply.
An action no longer leads to a consequence.
CAT: (Back on the bench) So, what is it?
KRYTEN: I think we've experienced this period of time before, Sir.
CAT: Only joking.
KRYTEN: And that one. Since we're no longer affected by the laws of
causality, we can override these time jumps if we concentrate.
RIMMER: Look, the only way out of this is to consult Holly.
CAT: (Snaps fingers) I'll go with that.
KRYTEN: Gets my vote.
LISTER: Okay, so it's decided then. We consult Holly.
KRYTEN: Ah, I think we've just encountered the middle of this
conversation!
CAT: So, what is it?
LISTER: Ooh, someone punch him out. Bring Holly up.
KRYTEN: She only has two minutes left. Perhaps I should talk to her.
RIMMER: Leave this to me, Kryten. (To terminal) On.

 

[silverpig]

Originally posted by: RossGr
There are indeed small black holes which can evaporate via Hawking radiation. BUT, the big boys, like the one in the center of our galaxy do NOT evaporate. The big ones just continue to grow, as they acrete MUCH more matter then they radiate.

Hawking radiation involves the formation of a virtual partical pair at the event horizon, if the virtual partical falls into the event horizon, the real particle which remains outside is seen as a loss in mass of the BH.

When normal matter falls into a BH it emits x-rays as a sort of dying scream. It is these xrays which have become the signature of a BH.

IMHO: most of the posts in this thread are unreliable, I would incourage anyone reading this to at least check some Physics/astrophysics specific forums or web sites to comfirm or deny what has been posted.

RossGr has it right. Virtual pairs of particles constantly pop into and out of existence all around us. When one happens to form right at the event horizon, one can escape while the other is trapped. The energy to maintain the real particle comes from the black hole itself.

IIRC the hawking radiation is sort of like a blackbody spectrum with "temperature" inversely proportional to some power of the mass (ie, big black holes look like large cool things, whereas small black holes look like small hot things).

 

[IHateMyJob2004]

Originally posted by: dainthomas

Originally posted by: spidey07
I thought it spits it out as x-rays.

X-rays can't escape any more than visible light (from beyond the event horizon anyway).

IIRC, the process has something to do with quantum mechanics and tunneling, but it's been a while since college physics.

WRONG!


X-rays are emitted .... PROOF:
http://en.wikipedia.org/wiki/Black_hole

Just go read it everyone
/thread

 

[everman]

Restaurant at the end of the universe.

 

[invidia]

Muse

 

[WHAMPOM]

Originally posted by: spidey07
I thought it spits it out as x-rays.

That is the matter breaking down to sub-atomic particles and releasing energy. The singularity eats matter and farts X-rays.

 

[silverpig]

Originally posted by: IHateMyJob2004

Originally posted by: dainthomas

Originally posted by: spidey07
I thought it spits it out as x-rays.

X-rays can't escape any more than visible light (from beyond the event horizon anyway).

IIRC, the process has something to do with quantum mechanics and tunneling, but it's been a while since college physics.

WRONG!


X-rays are emitted .... PROOF:
http://en.wikipedia.org/wiki/Black_hole

Just go read it everyone
/thread

Actually he's quite right. If x-rays are generated inside the event horizon (as he said, and as the OP asked) they won't get out. And it DOES have something to do with quantum mechanics.

 

[Jeff7]

Originally posted by: DaShen

Originally posted by: Mrvile

Originally posted by: Brainonska511
Black holes slowly "evaporate" 1 atom or so within a set interval, so eventually the matter that was sucked into the black hole will be redeposited into space.

Is that seriously what happens?

Yes slowly, the energy disappates as x-ray energy and high wavelength photons at the poles.

**EDIT**
BTW, Stephen Hawkings was the one who figured this out, and it is the theory that made him famous.

I think the X-Rays and high energy EM radiation come from the matter that's being superheated as it approaches the event horizon.
Hawking Radiation has to do with particle/anti-particle pairs. They form near the event horizon - one falls in, one escapes. In this way, the black hole slowly evaporates.

The jets at the poles are from magnetic fields, if memory serves correctly.

Originally posted by: RossGr
There are indeed small black holes which can evaporate via Hawking radiation. BUT, the big boys, like the one in the center of our galaxy do NOT evaporate. The big ones just continue to grow, as they acrete MUCH more matter then they radiate.

Hawking radiation involves the formation of a virtual partical pair at the event horizon, if the virtual partical falls into the event horizon, the real particle which remains outside is seen as a loss in mass of the BH.

When normal matter falls into a BH it emits x-rays as a sort of dying scream. It is these xrays which have become the signature of a BH.

IMHO: most of the posts in this thread are unreliable, I would incourage anyone reading this to at least check some Physics/astrophysics specific forums or web sites to comfirm or deny what has been posted.

Well there you have it. Virtual particle pairs.
I should re-read A Brief History of Time and The Universe in a Nutshell, both by Hawking.

Originally posted by: silverpig
Actually he's quite right. If x-rays are generated inside the event horizon (as he said, and as the OP asked) they won't get out. And it DOES have something to do with quantum mechanics.

Right on.

 

[eits]

Originally posted by: Snatchface
I know that black holes go around gobbling up everything in sight (kinda like Rosie O'Donnell) and it all gets smashed into the singularity adding to the gravitational pull (also like Rosie)...but what is the endpoint of a black hole? Does it eventually explode and become a new galaxy like the big bang?

wow.