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Io is among Jupiter's four largest moons and was discovered in 1610 by Galileo. Advances in space exploration and imaging technologies have since enabled scientists to discover even more moons orbiting Jupiter. For example, scientists used the Voyager 1 space probe to discover Adrastea in 1979. And more recently, researchers discovered 12 moons using the Dark Energy Camera at the Cerro Tololo Inter-American Observatory in Chile. As of 2023, the number of confirmed moons orbiting Jupiter was 95, and scientists think further exploration will reveal more.