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!!! Black Hole Gravity - speed of gravity
How can black holes have gravity when nothing can get out because escape
speed is greater than the speed of light? |
#2
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"Aunt Buffy" wrote in news:9z5Ac.261$Mx.8@newsfe2-
gui.server.ntli.net: How can black holes have gravity when nothing can get out because escape speed is greater than the speed of light? Physics FAQ: http://math.ucr.edu/home/baez/physic...lack_gravity.h tml LK |
#3
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Because it is their GRAVITY that pulls everything into the Black Hole.
-- Dragons Must Fly when Thread's in the Sky www.starlords.org "Aunt Buffy" wrote in message ... How can black holes have gravity when nothing can get out because escape speed is greater than the speed of light? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.706 / Virus Database: 462 - Release Date: 6/14/04 |
#4
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From Aunt Buffy:
How can black holes have gravity when nothing can get out because escape speed is greater than the speed of light? Good question. Many researchers believe gravity "propagates" from its source at the speed of light. If this is so, how does a black hole's gravity 'get out' of the event horizon, apparently with total ease? oc |
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A recent experiment measured gravity and concluded that it travels at the
speed of light. Thus if the sun disappeared Earth would continue in its orbit for a 8 minutes before going off on a "tangent". So if the speed of gravity is "the speed of light" how can it escape (and e.g. force an accompanying star to shed its material to feed the black hole)? Llanzlan Klazmon The 15th pointed me to http://math.ucr.edu/home/baez/physic...ack_gravity.ht ml My interpretation is: "Gravity waves" that we see outside of the blackhole were generated before the formation of the black hole and that due to the time dilation effect take "a long time" to emerge and become noticable to us( outside of the event horizon). Thus the gravity we are seeing outside of the black hole now could well have been generated 10000years ago (more likely longer ago). The gravity waves since the creation of the black hole are not able to escape. Am I out of my depth? "Aunt Buffy" wrote in message ... How can black holes have gravity when nothing can get out because escape speed is greater than the speed of light? |
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"Aunt Buffy" wrote in message
newsU8Ac.4$wS4.2@newsfe6-win... Am I out of my depth? Yes, but you're in good company. g |
#7
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From Aunt Buffy:
A recent experiment measured gravity and concluded that it travels at the speed of light. Yeah, that was the Fomalant-Kopeikin experiment. Touted as measuring the "speed of gravity", it was a unique, roundabout way of measuring the speed of light, nothing more, nothing lass. See- http://www.space,com/scienceastronom...ed_030116.html Llanzlan Klazmon The 15th pointed me to - http://math.ucr.edu/home/baez/physic...k_gravity.html Hoo boy. "Fossil fields" no less. And 'virtual gravitons' (!), virtual photons, and what else.. angels, imps, and Sky Pixies.. all to explain how gravity 'gets out' of a black hole. Hmm.. My interpretation is: "Gravity waves" that we see outside of the blackhole were generated before the formation of the black hole and that due to the time dilation effect take "a long time" to emerge and become noticable to us....The gravity waves since the creation of the black hole are not able to escape. Am I out of my depth? A bit out of your tree, perhaps. But you're certainly not alone. The mainstream does not grasp the clear distinction between gravity and 'gravity waves'. The latter should more correctly be defined as _spatial acoustic pressure waves_ in the fabric of space, analogous to sound waves in air (jb's protestations notwithstanding). And these mis-named 'gravity waves' DO propagate at c. They are _related_ to gravity, and are generated by massive gravitational events (such as a supernova detonation or a binary BH coalescence), but they are NOT gravity. The mainstream's void-space paradigm(VSP) precludes the understanding of gravity as the FLOW of the spatial medium into a gravitating mass. Whether the mass is a normal star or a black hole is irrelevant. The VSP precludes understanding that gravity's influence is _instantaneous irrespective of distance_ just as Newton originally observed. And it's instantaneous with or without an intervening event horizon. While this may be at odds with the interpretation of GR on the "speed of gravity", it is a fact. If it's not, and space is a "void", then we're stuck with "fossil fields", 'virtual gravitons', virtual photons, angels, imps, and Sky Pixies. oc |
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#10
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"Bill Sheppard" wrote in message
... A bit out of your tree, perhaps. But you're certainly not alone. The mainstream does not grasp the clear distinction between gravity and 'gravity waves'. The latter should more correctly be defined as _spatial acoustic pressure waves_ in the fabric of space, analogous to sound waves in air (jb's protestations notwithstanding). To any following this thread ... If you have any inclination of discussing such matters outside of the wild and wacky world of "alt.astronomy" (read - "with sane people") you would be best served to disregard BS's (OH, I like that! ... it works on so may different levels!) fantasies in their entirety. There is NO longitudinal component to Gravitational Waves. And these mis-named 'gravity waves' DO propagate at c. They are _related_ to gravity, and are generated by massive gravitational events (such as a supernova detonation or a binary BH coalescence), but they are NOT gravity. The mainstream's void-space paradigm(VSP) precludes the understanding of gravity as the FLOW of the spatial medium into a gravitating mass. Whether the mass is a normal star or a black hole is irrelevant. The VSP precludes understanding that gravity's influence is _instantaneous irrespective of distance_ just as Newton originally observed. And it's instantaneous with or without an intervening event horizon. While this may be at odds with the interpretation of GR on the "speed of gravity", it is a fact. A fact, is it??? If it's not, and space is a "void", then we're stuck with "fossil fields", 'virtual gravitons', virtual photons, angels, imps, and Sky Pixies. oc |
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