This Letterbox Hybrid IS at the posted coordinates and PLEASE DO NOT remove the stamp that is inside the cache.
This cache is Part of the Caches Across the Solar System series in Southern California, which will take visitors to scale representations of the Planets, Dwarf Planets, Moons, and Other Objects of the Solar System, with the Great Park Balloon representing the Sun. Find at least 9 CASS Caches across the 3 zones, stamp your passport, and turn it in at the Signal's Island Block Party (GCAXN0B) for prizes!
Io (/ˈaɪ.oʊ/) is the innermost and second-smallest of the four Galilean moons of the planet Jupiter. Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in the Solar System, has the highest density of any natural satellite, the strongest surface gravity of any natural satellite, and the lowest amount of water by atomic ratio of any known astronomical object in the Solar System.