Bring on the Back-ups: "The Day Krypton Didn't Die!" by Maggin and Buckler

Greetings, Groove-ophiles! Today let's get a little sci-fi--Kryptoninan style! Here's a very cool "Fabulous World of Krypton" back-up from Superman #251 (March 1972) written by Elliot S! Maggin and illustrated by Rich Buckler! Are you ready to witness..."The Day Krypton Didn't Die!"?