Galileo Galilee
Callisto was discovered by Galileo Galilei on Jan 7, 1610
Galileo
Galileo Galilei
Jupiter's moon, Callisto, a large rocky/icy body, was discovered in year 1610 by Galileo Galilei.
The moon Callisto was discovered in January of the year 1610. The moon belongs to the planet Jupiter.
The four largest moons of Jupiter discovered by Galileo are Io, Europa, Ganymede, and Callisto.
Callisto is one of the four largest moons of Jupiter. It is known for its heavily cratered surface and its icy composition. Callisto is considered to be one of the most heavily cratered bodies in the solar system.
The first moons discovered to orbit a body other than the Earth, they were discovered by Galileo Galilei in 1610. Their names are Io, Europa, Ganymede, and Callisto.
Callisto is the furthest out of Jupiter's four large moons discovered by Galileo. It can be seen next to Jupiter with a small telescope.
Earth's moon would have been the first moon discovered. Galileo observations identified four of Jupiter's moons - Io, Europa, Ganymede, Callisto - in 1610.
I think you are referring to Callisto. Callisto was raped by Zeus (disguised as Artemis). When Artemis discovered she was pregnant, she banished her from the Hunt since only virgins can be with her. This allowed Hera to turn her into a bear.
Neither. Both have been visible since anyone looked up in the night sky. So neither of them were discovered.