Metaluna was a planet inhabited by Metalunans and Metalunan Mutants.  It had a core of immense pressure and nuclear activity, unheard of in most planets, which required a thick crust of hard elements to hold in.  When the planet came under meteor bombardment by Zagons, the crust was eventually cracked through, releasing the energy and transforming the planet into a star.  Naturally everyone on its surface burned up in the process.

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