What Caused these craters?

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It was once speculated that these craters were connected by a tunnel. The tunnel was caused by a very fast, very dense asteroid, at a very low impact angle, causing the crater on the right. The impactor continued on underground glancing off the lunar mantle, and exiting from the crater on the left leaving a fan type ray system on the surface. The distance between the craters is 20 KM. Whatever caused these, it is a strange pair. They are called Messier and Messier A.

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