Summary:
- Researchers have successfully measured the properties of "superionic ice" (Ice XVIII), a phase of water that exists under extreme pressure and temperature conditions found in the interiors of giant planets like Neptune and Uranus.
- The study utilized high-energy X-ray diffraction at the Advanced Photon Source to observe the material's crystal structure, confirming that oxygen atoms form a rigid lattice while hydrogen atoms flow through it like a liquid, effectively acting as a "superionic" conductor.