It all works out nicely, until Galactus decides that it is time to eat up Apokalips.
He tried that one time and found it was too dead to be worth eating or something and just left.
Yup. In the "The Hunger" crossover by John Byrne.
Too bad... I was looking forward to some "heartburn" or "spicy" jokes about Galactus and Apokolips. "Hey Galactus, does Uranus burn after eating Apokolips? Hahahaha."
Okay, better jokes than that.