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explain the physics behind gravitational lensing.
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gravitational lensing is an effect caused by the warping of space-time due to a massive object in space. light that travels near the object is bent, causing the light to appear to come from different directions than it originally did. this phenomenon is a result of the bending of light due to the curvature of space-time. it can produce a magnified or demagnified image of the original source or a completely different image altogether.
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