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.
Jupiter has 67 confirmed moons, for now. It's complicated. Galileo discovered the four big ones in 1609 and 1610. Today they're known as the Galilean Moons: Io, Europa, Ganymede, and Callisto. The Galilean Moons of Jupiter.It took 282 years for the next Jovian moon to be spotted, which is remarkable, because a lot was discovered in the meantime (including the moons of Mars).upiter has 67 confirmed moons, for now. It's complicated. Galileo discovered the four big ones in 1609 and 1610. Today they're known as the Galilean Moons: Io, Europa, Ganymede, and Callisto. The Galilean Moons of Jupiter.