In Depth | Io – NASA Solar System Exploration
Jul 19, 2021 · Io was discovered on Jan. 8, 1610 by Galileo Galilei. The discovery, along with three other Jovian moons, was the first time a moon was discovered orbiting a planet other than Earth. The discovery of the four Galilean satellites eventually led to the understanding that planets in our solar system orbit the Sun, instead of our solar system ...
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