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Images taken by Voyager 1 proved the existence of volcanoes on Io (pictured), a moon of Jupiter.
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Voyager 1
NASA space probe launched in 1977
Voyager 1 is a space probe launched by NASA on September 5, 1977, as part of the Voyager program to study the outer Solar System and the interstellar space beyond the Sun's heliosphere. It was launched 16 days after its twin, Voyager 2. It communicates through the NASA Deep…Source: Wikipedia (CC BY-SA)
Volcanism on Io
Volcanism of Io, a moon of Jupiter
Io, a moon of Jupiter, has a substantial presence of volcanoes, volcanic pits and lava flows on its surface. Volcanic activity on the moon was first discovered in 1979 by Linda Morabito, an imaging scientist working on Voyager 1. Observations of Io by passing spacecraft and…Source: Wikipedia (CC BY-SA)
Io (moon)
Innermost of the four Galilean moons of Jupiter
Io is the innermost and second-smallest of the four Galilean moons of the planet Jupiter. Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in the Solar System, has the highest density of any natural satellite, the strongest surface gravity of any…Source: Wikipedia (CC BY-SA)
Moons of Jupiter
Natural satellites of the planet Jupiter
There are 97 moons of Jupiter with confirmed orbits as of 30 April 2025. This number does not include a number of meter-sized moonlets thought to be shed from the inner moons, nor hundreds of possible kilometer-sized outer irregular moons that were only briefly captured by…Source: Wikipedia (CC BY-SA)