It seems the bomb also transported the bar to the moon, and created an oxygen field around the bar. Unfortunately, when you leave the bar, you leave the oxygen field. You die of asphyxiation, and the Clangers eat your corpse.
*** You've been
turned off ***
Would you like to taste, taste a hairball, or taste this hairball of Zork Random? (type RESTART, RESTORE, or QUIT):