How does galactus survive without eating planets?
Quick Answer
Galactus requires consuming planets to sustain his life force, as explicitly stated in his origin and function within Marvel continuity.
Explanation
According to the verified evidence, Galactus is defined as a cosmic entity who consumes planets to sustain his life force. His role in the Marvel Universe is fundamentally tied to this planetary consumption, which serves a functional purpose in maintaining cosmic balance. The origin story describes him as a former mortal, Galan, who gained cosmic abilities after an encounter with a star, transforming into Galactus. However, the evidence does not describe any alternative method of survival or sustenance beyond consuming planets. The character's necessity to drain living planets of their energy is presented as an intrinsic part of his existence, with no indication of survival without this process. Thus, within the provided source, there is no basis to suggest Galactus can survive independently of planetary consumption.