Gravitational Lensing Diagram
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NASA/ESA/CSA/STScI
This diagram illustrates how rays of light from a distant galaxy or star can be bent by the gravity of an intervening galaxy cluster. As a result, an observer on Earth sees the distant object appear brighter than it would look if it weren't gravitationally lensed.
Credits
Image
NASA, ESA, Ann Feild (STScI), Frank Summers (STScI)