How Did the Moon Blow Up in Assassination Classroom?
To put it simply, Koro-sensei's transformation and resultant powers caused the moon to be blown up during a failed experiment.
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Koro-sensei, originally a human experiment gone wrong, blew up 70% of the moon during an experiment. It was his first major display of power.
The moon exploded because of Koro-sensei's transformation during an experiment gone wrong. Classic case of science going kaboom!
Koro-sensei, as a result of being a lab experiment, acquired immense power and demonstrated it by accidentally destroying most of the moon.
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