Galileo Galilei
- Galileo Galilei (1564-1642) was an Italian astronomer, mathematician, and philosopher.
- He invented the Thermometer (1593), the Compass (1597), the Telescope (1609), and the Pendulum Clock (1641).
- He was the first to use the telescope in the study of the heavens.
- Galileo discovered Jupiter’s moons called Calisto, Europa, Ganymede, and Lo.
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