No, not a science fiction question. In reality, what if.. a large enough to break the sphere impacted the moon.? with sufficient velocity to be so energetic as to actually blow a hole so large as to destroy the integrity of the moon. I have spent many hours looking ( playing ) at Earth impactors... The moon has just come into view and so.... ?
What would happen ? Other than a beautiful display of a exploding moon, throwing a plume of debris several lunar diameters from her... would it be catastrophic for all humanity ? I think so. But a lesser scale event would have a lesser degree of destructive force. Is it all impact energy related ? Lots of questions here but consider it all please... Mark the inquisitive astronomical gnome.