What is Einstein's Cross?

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Offline Joe L. Ogan

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What is Einstein's Cross?
« on: 08/02/2010 00:20:21 »
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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Offline JP

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What is Einstein's Cross?
« Reply #1 on: 08/02/2010 05:24:24 »
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.