Was the 737 flying at 150mph sideways? If that was a drone, it must have been going at some speed and was presumably the size of a fridge!
Nose domes are typically fiber layups and behave like a trampoline when struck at those speeds. Along the way on the inbound dent local separations of layers occur and partial fractures then on the rebound more damage propagates.
No doubt what hit it has left some clues inside the cracks or against the pressure wall of the cockpit