Explore Ideas: Learning & Discussing Space Probes & Gravity

juan avellaneda
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this is a great site for learning and discussing ideas...

well i have two questions
1. Whats the objetive of the mission space probe b?
was it launched yet?
2. Has been ever performed any experiment searching for the speed of gravity? (like fizeau's for light?)
 
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I think you may be reffering to Gravity Probe B. GP-B, as it is called, will test a couple of predictions made by einstein's General Theory of Relativity. One of these is Frame Dragging, the idea that the gravitational influence of an object with mass can not only warp or bend spacetime, but in the case of a rotating object, spacetime may be spun, as well. It is officially scheduled to launch on April 17th, 2004. You can sign up for weekly updates about the mission by going to majordomo@lists.Stanford.edu(you just upt the words "subscribe gpb-update" anywhere in the body of the e-mail) , I did !

It will not test the speed of gravity, but LIGO will. More accurately, it will look for gravity waves traveling at lightspeed. If they travel at any other speed, I suppose it won't find them at all.
 
gpb

ok lurch thanks for your valuable information
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
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Thread '1-Way Speed of Light'

Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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Thread 'How can a black hole absorb matter?'

According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
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