Galileo discovered Jupiter's moons with a homemade telescope
Galileo Galilei's 1610 discovery of Jupiter's four largest moons with his homemade telescope revolutionized astronomy, providing key evidence that Earth was not the universe's center.
In 1610, Italian astronomer Galileo Galilei aimed his homemade telescope at Jupiter and made a groundbreaking discovery: four small bodies orbiting the giant planet. These were the first moons ever seen around another planet, later named Io, Europa, Ganymede, and Callisto. This observation, published in his book *Sidereus Nuncius*, challenged the long-held belief that Earth was the center of the universe.
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