Why is the bulk of the impacting object rarely found intact at the center of the resulting crater?

Answer

The kinetic energy of cosmic velocities typically shatters, melts, or vaporizes the object.

Due to the extreme kinetic energy of objects traveling at cosmic velocities, the impactor is usually entirely dispersed as melt droplets or vaporized material rather than remaining as a recognizable body.

Why is the bulk of the impacting object rarely found intact at the center of the resulting crater?
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