Consider a large lunar crater, say 100 km across. What probably caused its formation?

Name: Consider a large lunar crater, say 100 km across. What probably caused its formation?
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The formation of large lunar craters is typically caused by the shock wave generated by a projectile considerably less than the crater's size. The kinetic energy of the impacting object is converted into the energy of the explosion and shock wave, which excavates a crater much larger than the projectile itself.

Consider a Large Lunar Crater, Say 100 Km Across