Galileo Galilei was born in Pisa, Italy, in 1564, the same year William Shakespeare was born and the year that Michelangelo died. Galileo was home schooled by his father, a nobleman well known for his musical studies. At the age of 11, Galileo was sent to the Benedictine Monastery of Santa Maria di Vallombrosa where he, like other children of the nobility, studied Latin, Greek, religion, and music. It was when he entered the University of Pisa in 1581 that Galileo began to question Aristotle's teachings, particularly his theory of falling objects. Aristotle proposed that objects of differing weights fall at different rates of speed. Galileo noticed, while on a walk, that hailstones appeared to hit the ground at the same time regardless of their size. His famous experiment dropping different size balls from the Leaning Tower of Pisa resulted in new ideas about physics and the idea that "laws" of science could, and should, be questioned. The image of Galileo standing atop the Leaning Tower and dropping objects is one that is common to many textbooks and science resource books because it symbolizes a turning point in science as a vehicle of inquiry.

Galileo's many and varied accomplishments span the scientific disciplines of astronomy, physics, and optics. He was also an inventor, mathematician, and author. After an unsuccessful time at the university, Galileo left formal education to study mathematics and physics on his own. By the 1580s, he became a Professor of Mathematics at the University of Pisa and then later at the University of Padua. He remained in Padua until 1610 where he spent time experimenting, studying, and inventing. By 1632, he had invented a geometrical and military compass, built a thermoscope, patented a machine to raise water levels, invented a tripod microscope, built a telescope, and wrote the controversial Dialogue on the Two Chief World Systems. Of the telescope, he said:

"A report reached my ears that a certain Fleming had constructed a spyglass.... Upon hearing the news, I set myself to thinking about the problem.... Finally, sparing neither labor nor expense, I succeeded in constructing for myself so excellent an instrument that objects seen by means of it appeared nearly one thousand times larger and over thirty times closer than when regarded with our natural vision."

This new instrument, the telescope (a word that was not used until 1611), would be the instrument of both Galileo's fame and his exile and imprisonment. While gazing through the telescope, Galileo observed and drew what he saw: the moon's phases, the Milky Way, clusters of stars, and phenomena that seemed to confirm his idea that the Earth was not the center of the universe. Contrary to the popular Ptolemaic system, Galileo hypothesized that the Earth was one of many heavenly bodies that comprise our solar system.

Galileo's views were not readily accepted by the Church and he was called before the Pope to account for his dissident views. Asked to give up the very ideas that he could support through his own observations, Galileo refused and was exiled in Siena. At the age of 69, Galileo was allowed to return to his home. Over the next several years, his health declined and he became totally blind. His only source of help, his daughter Sister Marie Celeste, died in 1634. In 1642, the year in which Isaac Newton was born, Galileo died at his home.

Although Galileo is remembered for both his experiments with gravity and for his astronomical observations, his invention of the telescope is probably his most significant contribution. Other significant areas of Galileo's influence include mechanics, microscopy, and magnetism.

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