Who Discovered Jupiter’s Second Largest Moon Callisto and What Is Callisto Made Of?
The third-largest moon in the Solar System Callisto was discovered in 1610 by Galileo Galilei. The farthest Galilean moon from Jupiter, Callisto is mostly made of ice and rock. Its surface shows many craters, but unlike our Moon craters, these are rather shallow with low walls encircling them. Callisto’s craters were probably pa
