physicist, mathematician, astronomer, and philosopher.
Galileo lived in the Grand duchy of Tuscany, Italy.
Galileo improved the telescope. Galileo made many planetary accomplishments. Also formulated the law of inertia.
The Catholic Church did not agree with Galileo's ideas.
Galileo discovered Jupiter's four largest moons. Io, Europa, Ganymede, and Callisto are the four Galilean moons.