A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from Viewpoint A, the object appears to be in front of the blue square. When the viewpoint is changed to Viewpoint B, the object appears to have moved in front of the red square.
From top to bottom: Io, Europa, Ganymede, Callisto. The Galilean moons are the four largest moons of JupiterâIo, Europa, Ganymede, and Callisto. They were discovered by Galileo Galilei around January 1610 and were the first group of objects found to orbit another planet. Their names derive from the lovers of Zeus.
Moons of Jupiter. There have been 63 moons discovered hovering around Jupiter. It is divided into different groups: the Main group or Galilean moons, the Inner satellites or Amalthea group, the Himalia group, the Carme group, the Anake group and the Pasiphae group.