👉 Planetary fluids refer to the dynamic, often liquid-like states of certain materials present within or on planets, driven by internal heat and gravitational forces. These fluids can include molten rock (magma) beneath the surface, oceans of liquid water or other volatiles like ammonia or methane on icy moons, and even supercritical fluids in the deep interiors of gas giants. The movement of these fluids is crucial for planetary processes such as plate tectonics, volcanic activity, and the generation of magnetic fields. For instance, on Earth, the movement of molten iron in the outer core generates the planet's magnetic field through a process known as the geodynamo. Similarly, on icy moons like Europa and Enceladus, subsurface oceans of liquid water are thought to interact with rocky cores, potentially creating hydrothermal vents that could support life. These fluid dynamics play a key role in shaping planetary evolution and habitability.
