Libration refers to the movement of orbiting bodies in relation to one another. For instance, the movement of the Moon Relative to the Earth is an example of a Libration. One of the common examples of Libration is Lunar libration. The moon consists of a singular hemisphere, which faces the earth. Over time more of the Moon’s surface more than 50 percent of the surface of the Moon has started to be visible to the earth because of Libration. In [...]

The Galilean moons/satellites are Jupiter’s four moons discovered by Galileo Galilei. Jupiter has many moons that orbits around it. These four moons are the largest of those moons. And its names were derived from the lovers of Greek god, Zeus. Those are Io, Europa, Ganymede and Callisto. Io is the innermost Galilean moon. It is the 4th largest moon in the solar system. It was referred as the first satellite of Jupiter. Europa is the second moon of the four. [...]