Io
A moon of Jupiter named after Io, the priestess of Hera whom Zeus transformed into a white cow, now known as the most volcanically active body in the solar system
The Meaning of Io
Io is the innermost of Jupiter's four Galilean moons and the most volcanically active body in the entire solar system. It was named after Io, a priestess of Hera at Argos, whom Zeus seduced. To hide his affair from Hera, Zeus transformed Io into a beautiful white cow. Hera, suspicious, demanded the cow as a gift and set the hundred-eyed giant Argus Panoptes to guard her. Zeus sent Hermes to lull Argus to sleep and slay him, but Hera then sent a gadfly to torment Io, driving her to wander across the world in misery — crossing what would be called the Bosporus ("cow-ford") and the Ionian Sea, both named after her journey. Io eventually reached Egypt, where Zeus restored her human form and she bore his son Epaphus, ancestor of the Egyptian royal line. The moon Io's intense volcanic activity — with over four hundred active volcanoes — is caused by tidal heating from Jupiter's massive gravitational field, which flexes the moon's interior. Io's surface is constantly reshaped by eruptions, making it one of the most dynamic environments in the solar system.
Parents
None recorded
Symbols
Fun Fact
Io has over four hundred active volcanoes, making it the most geologically active body in the solar system — its entire surface is remade by eruptions every million years
Explore Further
Europa
💭 conceptAstronomy and mythology
A moon of Jupiter named after Europa, the Phoenician princess abducted by Zeus in the form of a white bull, now one of the most promising candidates for extraterrestrial life
Callisto
💭 conceptAstronomy and mythology
A moon of Jupiter named after Callisto, the nymph companion of Artemis who was transformed into a bear and placed among the stars as the constellation Ursa Major
Ganymede
💭 conceptAstronomy and mythology
The largest moon in the solar system, named after Ganymede, the beautiful Trojan prince abducted by Zeus to serve as cupbearer of the gods on Olympus
Triton
💭 conceptAstronomy and mythology
The largest moon of Neptune, named after Triton, the merman son of Poseidon, notable for being the only large moon in the solar system that orbits in the opposite direction to its planet
Charon
💭 conceptAstronomy and mythology
The largest moon of Pluto, named after Charon, the ferryman who transported the souls of the dead across the River Styx to the underworld of Hades
Jupiter
💭 conceptAstronomy and mythology
The largest planet in the solar system, named after Jupiter, the Roman king of the gods identified with the Greek Zeus, because of its commanding size and brightness
Saturn
💭 conceptAstronomy and mythology
The sixth planet from the Sun, named after Saturn, the Roman god of agriculture and time identified with the Greek Titan Kronos, father of Zeus
Aphrodite
💭 conceptAstronomy and mythology
The planet Venus is named after the Roman equivalent of Aphrodite, the Greek goddess of love and beauty, because it is the brightest and most beautiful object in the night sky after the Moon
Venus
💭 conceptAstronomy and mythology
The second planet from the Sun and the brightest natural object in the night sky after the Moon, named after Venus, the Roman goddess of love identified with the Greek Aphrodite
Pluto
💭 conceptAstronomy and mythology
A dwarf planet named after Pluto, the Roman god of the underworld identified with the Greek Hades, chosen because of its extreme distance and darkness at the edge of the solar system
Uranus
💭 conceptAstronomy and mythology
The seventh planet from the Sun, named after Ouranos, the primordial Greek god of the sky and the earliest supreme deity in the mythological genealogy
Goddess of the Moon
💭 conceptMoon, night sky, lunar cycles
Selene drives her silver chariot across the night sky, illuminating the world with reflected light.