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It's well known that light bends. When light rays pass from air into water, for instance, they take a sharp turn; that's why a stick dipped in a pond appears to tilt toward the surface.
Out in space, light rays passing near very massive objects such as stars are seen to travel in curves. In each instance,
light-bending has an external cause: For water, it is a change in an optical property called the refractive index,
and for stars, it is the warping nature of gravity.
http://www.sciencemag.org/news/2012/...t-bends-itself