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Optoelectronics, Optics, Lights and Lasers > Non-Coherent Light Sources > Gas Discharge Lamps > 

can a black hole expand faster than light?

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Author Topic: can a black hole expand faster than light?  (Read 376 times)
neongrayscale
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« on: June 27, 2011, 07:52:49 AM »
Or is there any way not to see one? (i know that light cannot escape them, and that's how you find them, but could it be moving faster than the light that shows its gone?)
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me
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« Reply #1 on: June 27, 2011, 06:25:17 PM »
no
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Caolan_C
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« Reply #2 on: June 28, 2011, 12:49:39 AM »
No. Nothing moves faster the light. That's the entire law upon which the universe is built.
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Mike1942f
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« Reply #3 on: June 28, 2011, 01:37:47 AM »
black holes don't expand
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Prof__Strange
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« Reply #4 on: June 28, 2011, 05:58:10 AM »
Black hole is actually one of the greatest mystery of the universe, we know so very little about it.

There is an article that probably relate to your question, so it could be interesting for you.

It discuss about that the black hole release some amount of radiation away from the black hole as if it is star itself even if it is not.

Here is the article.

http://www.bbc.co.uk/news/science-environment-13809567
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Morningfox
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« Reply #5 on: June 28, 2011, 06:32:43 AM »
I think you are asking if the event horizon could expand faster than light.  The answer is no.  The event horizon expands when more matter falls into the BH.  But the matter can not fall faster than light.  Besides, the event horizon depends on the gravity of the matter in the BH.  The matter falling in has its own gravity, and adds that to the BH's gravity.  

What is important to realize, is the the in-falling matter has existed since the universe started.  It did not just magically appear out of nowhere.  So the gravity of this matter has spread over the whole universe.  As the matter falls into the BH, it brings its gravity with it.  Since the matter is moving slower than light, the gravity is also moving slower than light.  And the event horizon is a gravitational thing.
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odimwitdwon
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« Reply #6 on: June 28, 2011, 07:33:40 AM »
The theory "explaining" the existence of black holes requires that c be the limiting velocity in our Universe.  For everything, including gravitational charge carriers.  Nothing, not even gravity, travels faster than the speed of light.  We have numerous experiments demonstrating that gravity acts at light speed.  Could it be a little more (or less)? >  Why, yes I believe it could.
See a black hole?!?!  Know you nothing?  You can see the EFFECTS of a bh, including the accretion disk orbiting it and the "hole" in back of it where the stars should be shining.  You can't see a black hole (Hawking Radiation, excepted).
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Aaron_s_Girl__
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« Reply #7 on: June 28, 2011, 08:29:10 AM »
Scientist once thought nothing was faster than the speed of light.But they were proved wrong by the big bang theory.According to the big bang theory the universe expanded faster than the speed of light this is called plank time.The end of a black whole looks something like the big bang.Black wholes spin so fast they eat light.So they must be faster then light.Black wholes are a big mystery inside them all the laws of physics break down.Even time itself stops.It can eat light from many light years away.
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Ben_Swert
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« Reply #8 on: June 28, 2011, 08:52:51 AM »
black holes are not real, no proof, they are made up by the "experts" to make the lies they tell fit in
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