Question: What is the Einstein cross? 1 . The cross that Einstein gave his first wife as a Christmas gift. 2 . A light source that

What is the Einstein cross?
1.The cross that Einstein gave his first wife as a Christmas gift.
2.A light source that is being gravitationally lensed into 4 distinct copies.
3.A light source that is being gravitationally lensed into a circular shape.

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