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Physics, Astronomy & Cosmology / Re: Is it possible to build a gravity shield?
« on: 02/02/2018 21:49:49 »Let's shift gears a bit. Consider gravitational waves. Would it be theoretically possible to emit a cancelling gravitation wave, thereby cancelling gravity out in the region where they collide?No, because gravitational waves are not responsible for gravity. They carry information about changes in the gravitational field. Thus if you were to induce a change in the gravitational field at some point, then the information of this change would propagate at c to other points of the field as a gravitational wave. To create a second cancelling wave, you would have to induce another change in the field. For this to cancel out the first wave entirely, it would have to cancel out the initial change in the field. You might be able to arrange to gravitational waves to intersect at a point in such a way that they cancel out at that point. But that just means that that point doesn't measure or detect the distant changes in the field that created the waves. Thus its local field strength simply remains the same and it is not subject to any change in gravity.
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