When Galileo Galilei was younger, many interesting things happened. 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 childhood. Michelangelo was the youngest of six children. Galileo's full name was Galileo di Vincenzo Bonaiuti da' Galilei. When he was 8, his family moved to Florence, but he was sent to live with Jacopo Borghini for two years. Galileo proved to be very intelligent as a child. Galileo was a young boy who loved music and painting, as expected due to the house he lived in. Galileo always made mechanical toys for his amusement. Vincenzio was determined that his son would learn and inherit his wool business, but he made it his top priority to give him a good education. When Galileo was 10, his father sent him to a nearby school; the school was the monastery of Santa Maria Vallombrosa. The monks taught Galileo to prepare him for university. Galileo studied many different subjects such as Latin, Greek, logic and religion. Galileo became proficient on several musical instruments such as the lute. Galileo also wrote poems as a child. Most of what Galileo studied came from the writings of St. Thomas Aquinas. Thomas Aquinas was a priest and philosopher who lived from 1226 to 1274; he studied the ideas of the Greek philosopher Aristotle. Galileo Galilei had many people who had a great influence on him. Copernicus greatly influenced Galileo. Copernicus created the theory of the solar center. The Catholic Church did not support this theory, but Galileo firmly believed it to be true and attempted to prove it using a space telescope or spyglass. On August 25, 1609, he presented his first telescope to Venetian legislators. His telescopes were profitable. He could sell them to merchants who found them useful at sea and as trade items. On January 7, 1610, Galileo observed with his telescope the stars very close to Jupiter, and in a straight line. On January 10, Galileo noticed the disappearance of one of them. After a few days, he believed that they revolved around Jupiter: he had discovered three of the four largest moons of Jupiter, he discovered the fourth on January 13. These moons are now called Io, Europa, Ganymede and Callisto. Galileo named the group four stars, in honor of his business support group, Cosimo II de' Medici, Grand Duke of Tuscany, and Cosimo's three brothers. However, later astronomers renamed them Galilean satellites in honor of whoever discovered them..