why does galactus eat planets

Galactus eats planets because he is a cosmic entity who needs to consume the energy from planets to sustain his life force. His hunger is eternal, and he converts the matter of planets into energy. This feeding sustains him and plays a crucial role in maintaining the cosmic order of the Marvel Multiverse. Galactus' consumption of planets is not driven by malice; rather, it is a necessary act for generating enough energy to help birth the next iteration of the universe. He typically targets planets with life because the conscious energy from sentient beings fuels the Power Cosmic that sustains him. He often uses advanced technology like the Elemental Converter to drain planets of their life energy, leaving behind a lifeless husk. Although Galactus has been a threat to many worlds, including Earth, he is sometimes seen as a force necessary for cosmic balance and renewal.