system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] why did Krypton explode?
gpt
There have been numerous accounts 

* A natural supernova 

* Damage done to the planet’s core by a terrorist group using an ancient super weapon from an ancient conflict called (get this) the Clone Wars 

* Over-mining of the planet 

* Brainiac (or at least he gave them bad advice to ensure they wouldn’t escape)