Galileo Galilei was born on February 15, 1564 in Pisa, Italy. In 1570 his family relocated to Florence. Galileo pioneered "experimental scientific method" and was the first to use a refracting telescope to make important astronomical discoveries.
In 1581, Galileo studied at the University of Pisa. There he became interested in the workings of science and concluded that the period (the time in which a pendulum swings back and forth) does not depend on the arc of the swing (the isochronisms).
In 1609 Galileo learned of the invention of the telescope in Holland. From the barest description he constructed a vastly superior model. Galileo made a series of profound discoveries using his new telescope, including that the moon has craters, valleys, and mountains much like the Earth's terrain. He also was able to see four small lights orbiting around the planet Jupiter. He was then able to conclude that it too was moons. Galileo was also able to discover that the planet Venus had......
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