Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: Joe L. Ogan on 08/02/2010 00:20:21
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What is Einstein's Cross? Does it have any significance in the scientific world. Please explain. Thanks for comments. Joe L. Ogan
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Real lenses (the kind you'd find in glasses or cameras) work by bending light. Einstein's general relativity predicts that gravity can also bend light, so that if you have a large mass between you and some object, the light can get bent around it. Einstein's cross is an example of this bending, where four images of a quasar show up because of the way a distant galaxy is bending the quasar's light.