1983 Event Light flashes seen on Jupiter moon Io 1979 Event 1st extraterrestrial volcano discovered on Io, a satellite of Jupiter 1963 Birthday Dan Goldie, Sioux City IO, tennis star 1955 Birthday Ellen Dolan, Monticello IO, actress, Guiding Light, Margo Hughes-ATWT 1610 Event Galileo discovers 1st 3 Jupiter satellites, Io, Europa and Ganymede
