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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...
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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.
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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.
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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
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