Many interesting things happened when Galileo Galilei was younger. Galileo Galilei was born in Pisa, Italy; to Vincenzo Galilei and Giulia Ammannati. As a child, Galileo was the eldest of six children, but only four names are known because the other two children did not survive infancy. Michelangelo was the youngest of six children. Galileo's full name was Galileo di Vincenzo Bonaiuti da' Galilei. At the age of 8 his family moved to Florence, but he was sent to live with Jacopo Borghini for two years. Galileo proved to be very intelligent even as a child. Galileo was a little boy who liked music and painting as expected due to the family he lived in, Galileo always built mechanical toys for his entertainment. Vincenzio was determined that his son would learn and inherit his wool selling business, but his top priority was to get him educated. When Galileo was 10 years old, his father sent him to a nearby school; the school was the monastery of Santa Maria Vallombrosa. The monks would teach Galileo to prepare him for the University. Galileo studied many different subjects such as Latin, Greek, logic and religion. Galileo became proficient in several musical instruments such as the lute. Galileo also wrote some poems as a child. Most of what Galileo studied came from the writings of St. Thomas Aquinas. Aquinas was a priest and philosopher who lived from 1226 to 1274; studied the ideas of the ancient Greek philosopher Aristotle. Galileo Galilei had many people who were very influential to him. Copernicus greatly influenced Galileo. Copernicus created the solar center, theory. The Catholic Church did not support this theory, however Galileo firmly believed it to be true, and attempted to prove it, using... means of paper... a telescope, or telescope. On 25 August 1609 he demonstrated his first telescope to Venetian legislators. His telescopes were profitable. He could sell them to merchants who found them useful at sea and as an item of trade. On January 7, 1610, Galileo observed with his telescope the stars all close to Jupiter, and in a straight line. On January 10, Galileo noticed that one of them had disappeared. Within a few days he thought they were orbiting Jupiter: he had discovered three of Jupiter's four largest moons, he discovered the fourth on January 13. These moons are now called Io, Europa, Ganymede, and Callisto. Galileo named the group of four stars, after his business support group, Cosimo II de' Medici, Grand Duke of Tuscany, and Cosimo's three brothers. Later astronomers, however, renamed them Galilean satellites in honor of the person who discovered them.