Think of it this way, the universe is filled with invincible wrinkles, dips, bends and heights, everywhere gravity sticks up it ugly nose bending SpaceTime, including frame dragging by rotating black holes. No paths we make can be as straight and to the point as those taken by photons. And that makes the light the true master of the straight path. No Light take always the least energy consuming path there is, therefore it also takes the cheapest path. According to Einstein, your weight on earth is due to the fact that your body is traveling through warped spacetime!”. In the same way gravitation in Einstein's theory arises not as a force propagating through spacetime, but rather as a feature of spacetime itself. This occurs, not because the smaller mass is "attracted" by a force emanating from the larger one, but because it is traveling along a surface which has been deformed by the presence of the larger mass. If a marble is placed onto the rubber sheet, it will roll toward the bowling ball, and may even be put into "orbit" around the bowling ball. A standard way to illustrate this idea is to place a bowling ball (representing a massive object such as the sun) onto a stretched rubber sheet (representing spacetime). This is the core of Einstein's theory of general relativity, which is often summed up in words as follows: "matter tells spacetime how to curve, and curved spacetime tells matter how to move". Gravity feels strongest where spacetime is most curved, and it vanishes where spacetime is flat. Space and time in Einstein's universe are no longer flat (as implicitly assumed by Newton) but can pushed and pulled, stretched and warped by matter. The distortion of the space-time continuum even affects the behavior of light…” “ Gravity as Curved Spacetime Einstein eventually identified the property of spacetime which is responsible for gravity as its curvature. oh my word, no it is their-zz “ According to Einstein's General Theory of Relativity, matter bends the fabric of space and time. more like a longitudinal wave rather than a transverse wave. Personally, I think it's possible, or even probable, that the passage of light through space-time will have some effect upon it, but rather than curving it or changing its size at right-angles to the direction that the light is travelling in, as would be the case if space-time were to be curved by the passage of the light, I would suspect that space-time might be compressed in the direction that the light is travelling i.e. if light curved space-time both left and right then that space-time would get bigger or smaller depending on whether the curvature diverged or converged. However, if the curvature was in all directions it would amount to a changing of the size of space-time i.e. If this were the case though, then we wouldn't see a net curvature in direction because the sum of the curvature in all directions would effectively cancel out, leaving us with 'straight' space-time again, at least in terms of direction. For example, if the light were to curve to the left, then why should this be so, and why shouldn't it curve to the right instead, there being no obvious reason for a bias either way? If light were to curve space-time then, it would make more sense to me for it to curve space-time in all directions, which we could imagine as curving both left and right simultaneously. Also, there's the issue of what direction the curvature was expressed. I don't think light will curve, or bend space-time, at least in just one dimension, thus changing a straight path to a curved one, for if it did then light would follow a curved path in 'free' space and nothing would actually be where it appeared to be.
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