More gravity...

[alexander]

Originally Posted by Aki

I think it was from Greene's video on the Elegant Universe. It talks about if the sun vanishes, we would still see it light for another 8 minutes, however at the instant it vanishes, the earth would not be orbiting as it used to do.

and i think i brought it up once or twice throughout my answers here and there...

Originally Posted by wholloway

I would think that if gravity can travel at the speed of light then it would follow the same laws of relative motion.

what are you talking about? Speed of gravity is the speed of interaction between two massive objects, and by no means is it the speed of light, the estimates speed of gravity is 2x10^10 c well according to http://www.ldolphin.org/vanFlandern/gravityspeed.html research anyhow...

I'm actually surprised that freethinker hasn't said anything yet, but beware, he is outhere as well as Gahd...

I'm not that knowledgeble on gravity Tormod, Uncle, Freethinker and Gahd would be the guys to see, but this model you present seems to touch basis on general relativity and Einsteins space-time continuum theory in the curvature of space. As it says, space/time continuum curves around massive (meaning objects that have mass) objects and everything travels through it (the continuum), be that light or an asteroid.

Originally Posted by wholaway

Eventually there would be zero gravity, but what happens while the field is collapsing. If a mass suddenly vanished would the gravity field collapse like a magnetic field or would the field disapate from the center out. If the sun suddenly disapeared the lights wouldn't go out for eight minutes. Also we would still feel its gravity for eight minutes. What happens at the instant the field passes you by. On the side towards the sun you have zero gravity, on the side away from the sun you still have a gravity field. Does this field pull you toward it?

Well, and i think this has been said, nothing could possibly just disappear, energy remains constant, it can be transformed from one type of energy to another, but it can not just disapear...
No we will not feel its gravity for eight minutes, not even for a second...
Zero gravity? What about all that gravity that is "created" by the little, but existant mass of the Earth? What about the moon gravitational field? What will happen is the moon will crash into earth in a couple of hours(maybe more) while earth is on its way out of this system followed by a whole bunch of asteroids from the belt. To visualize, think about you swinging (or spinning in circle rather) a weight at the end of the rope, sun disappearing = you letting go.

Originally Posted by Aki

I think it was from Greene's video on the Elegant Universe. It talks about if the sun vanishes, we would still see it light for another 8 minutes, however at the instant it vanishes, the earth would not be orbiting as it used to do.

I read about it, but dint see the video, i know that there was research done to figure out the speed of particle interaction

[Aki]

Well here's the link to the video, it's worth watching, and I find it easier to understand with visuals
http://www.pbs.org/wgbh/nova/elegant/program.html

[alexander]

Thanks Aki, I will definately take a look. I think that the link was posted on the forum already a little while ago, my problem is that Linux Firefox still doesnt have a plugin for it, or I cant find one forit anyways... But I'll try to figure something out.

[lindagarrette]

Originally Posted by alex

and i think i brought it up once or twice throughout my answers here and there...

what are you talking about? Speed of gravity is the speed of interaction between two massive objects, and by no means is it the speed of light, the estimates speed of gravity is 2x10^10 c well according to http://www.ldolphin.org/vanFlandern/gravityspeed.html research anyhow...

Then there is this story published five years later::

First speed of gravity measurement revealed

20:30 07 January 03 NewScientist.com news service

The speed of gravity has been measured for the first time. The landmark experiment shows that it travels at the speed of light, meaning that Einstein's general theory of relativity has passed another test with flying colours.

[gpdone]

Originally Posted by lindagarrette

Then there is this story published five years later::

First speed of gravity measurement revealed

20:30 07 January 03 NewScientist.com news service

The speed of gravity has been measured for the first time. The landmark experiment shows that it travels at the speed of light, meaning that Einstein's general theory of relativity has passed another test with flying colours.

This is a GOOD example of BAD science. All they proved is that a phenomenon that is the result of light speed dynamics travels at the speed of light. Big surprise! In 1915 the scientists of the time gave zero consideration to atmospheric (optical) effects. Space at that time was assumed to be a true vacuum. My FTL demo in the Science Projects forum demonstrates an effect that occurs well before optical sunrise/set and can only be a gravity effect. Modern orbital dynamics already counters such claims of light speed gravity by the popular press and the researches that allow such claims to stand.

Lee

[BlameTheEx]

Originally Posted by lindagarrette

Then there is this story published five years later::

First speed of gravity measurement revealed

20:30 07 January 03 NewScientist.com news service

The speed of gravity has been measured for the first time. The landmark experiment shows that it travels at the speed of light, meaning that Einstein's general theory of relativity has passed another test with flying colours.

Any chance of a link, or a quote of the whole article?

[gpdone]

Voilla!

http://www.newscientist.com/news/news.jsp?id=ns99993232

[Tormod]

We featured this research here as well:

Speed of Gravity Researcher Stands Behind Theory
http://www.hypography.com/article.cfm?id=33083

[alexander]

I've read the article, i've seen it before, but never had the time to read through it, again' I'm not that knowledgeble about gravity, I was reading through some articles here and there, and most of them dint metion anything about speed of gravity = speed of light, but then it doesnt support the speed of particle interaction experiment. Cant tell you all about it, it's been a while since i read about it, but there was an experiment done to calculate the speed of particle interaction, with 2 molecules sent out in 2 different direction, and one's polarity was changed, they measured the amount of time it took the other one to start rotating in the other direction, and it was instanteneous..... but maybe i'm wrong and imagining things....

[Aki]

Originally Posted by alexander

Thanks Aki, I will definately take a look. I think that the link was posted on the forum already a little while ago, my problem is that Linux Firefox still doesnt have a plugin for it, or I cant find one forit anyways... But I'll try to figure something out.

oh really? I viewed it with firefox. Do you have Quicktime installed?