Possible Duplicate:
How does gravitational lensing account for Einstein’s Cross?
Einstein's Cross is a fascinating phenomena for which I have asked explanation here. However, I'm also interested to know if Einstein's cross was a specific prediction that people had obtained from Einstein's theories such as General Relativity or if the phenomena was merely named after Einstein. The wiki page on Einstein's Ring explains how the gravitational lensing phenomena of rings was predicted by general relativity, however I have yet to discover evidence that Einstein explained why there are 4 dots instead of a ring/crescent.
