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Loading contentIo is the innermost of the four Galilean moons of Jupiter and is intensely volcanic.
moon:ioDataset membership
Scientific entity. See the evidence framework and authority dashboard.
How Io connects across Asteria Star — scientific, cultural, and astrological links are kept separate.
Galileo Galilei was an Italian astronomer and physicist who pioneered telescopic astronomy, discovering the four largest moons of Jupiter.
Jupiter orbiter · NASA · launched 1989.
In January 1610 Galileo saw four points of light beside Jupiter that changed position night after night — moons orbiting another world.
The eruption of molten rock from a planet's interior onto its surface — from Earth's volcanoes to the relentless silicate volcanism of Jupiter's moon Io, the most volcanically active body in the Solar System, whose surface and plumes are painted with sulphur and sulphur-dioxide frosts.
Amalthea is a small, reddish inner moon of Jupiter orbiting closer to the planet than the Galilean moons.
Ariel is a moon of Uranus and the brightest of its major satellites.
Callisto is the outermost of the four Galilean moons of Jupiter and is heavily cratered.
Charon is the largest moon of the dwarf planet Pluto, roughly half Pluto's diameter.
Deimos is the smaller and outer of the two natural satellites of Mars.
Dione is an icy moon of Saturn marked by bright wispy fractures across its surface.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.