On 7 January 1610, Galileo used his telescope to observe some of what he described at the time as "a Downing three planets invisible 2. It is very small, "the three stars near Jupiter. And located in the same plane all [25] observed the following night it appeared that the position of the "stars" of those opposed to Jupiter is changing in ways that can not be explained if it is a star real date. January 10 Galileo noted. One of the three stars had disappeared. He explained that it was hiding behind Jupiter. Within a few days, he came to the conclusion that those stars orbit around Jupiter 3. Galileo discovered the moons, the largest of Jupiter's three-quarter moon Io, Europa and Callisto later, he discovered the moon is the fourth, Ganymede, on January 13 Gallipoli. Galileo named the four moons he discovered that the star Mediolanum Forum in honor of his patron Cosimo de Medici, the second Grand Duke of Tuscany. And his brother, three others [4] but later. Astronomers have named the moon, lose it. Galilean moons In honor of Galileo himself.
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