Io (moon) - Wikipedia
Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in the Solar System, has the highest density and strongest surface gravity of any natural satellite, and the lowest amount of water …
Io - Science@NASA
Jun 25, 2025 · Jupiter's moon Io is the most volcanically active world in the solar system, with hundreds of volcanoes, some erupting lava fountains dozens of miles (or kilometers) high.
Io, Jupiter’s chaotic volcano moon | The Planetary Society
Io is the innermost and third-largest of Jupiter’s four Galilean moons. Io is covered in hundreds of volcanoes. It is the most volcanically active world in the Solar System. Io can help us understand …
Io | Surface, Volcanoes, & Facts | Britannica
Dec 17, 2025 · Io, innermost of the four large moons (Galilean satellites) discovered around Jupiter by the Italian astronomer Galileo in 1610. It is the most volcanically active body in the solar system. As …
What’s Going On Inside Io, Jupiter’s Volcanic Moon?
Apr 25, 2025 · NASA’s Voyager 1 probe photographed Io in 1979, revealing the first glimpse of volcanism beyond Earth. In this photo mosaic, a lava plume is seen emanating from Loki Patera, …
Jupiter's moon Io is a volcanic hellscape—and has been since the solar ...
Some, like Europa or Enceladus, have spectacular and perhaps even habitable liquid water oceans. And then there’s Jupiter’s moon, Io. Io is the most volcanic object known to science.
Io: A guide to Jupiter's volcanic moon | Space
Oct 26, 2022 · Io — Jupiter's fifth moon — is the most volcanically active body in the solar system. Io's surface is peppered with hundreds of volcanoes, some spewing sulfurous plumes hundreds of miles …
Io (moon) - Wikiwand
Io is the innermost and second-smallest of the four Galilean moons of Jupiter. Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in ...
Io | Galilean Moon of Jupiter | GO ASTRONOMY
Io is one of the four Galilean moons of planet Jupiter. It is the hottest moon in the solar system, recording up to 2,600°F around its 400 volcanoes, hotter than Earth's volcanoes.
Jupiter's Moon Io
Io [EYE-oh or EE-oh] can be classified as one of the most unusual moons in our solar system. Active volcanism on Io was the greatest unexpected discovery at Jupiter.