In January 1610, Italian astronomer Galileo Galilei discovered four of Jupiter's moons — now called Io, Europa, Ganymede and Callisto. He originally referred to the individual moons numerically as I, II, III, and IV.
Explanation:
Galileo di Vincenzo Bonaiuti de' Galilei was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa. Galileo has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "father of modern science".
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Answer:
astronomer Galileo Galilei
Explanation:
astronomer Galileo Galilei
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