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© USGS Astrogeology Research Program

Mean Radius: 1830 km
Mass: 8.94x1022 kg
Orbital Period: 1.769 Earth days
Rotation Period: 1.769 Earth days
Orbit: 422,600 km from Jupiter

Io one of the four Galilean moons of Jupiter. The other Galilean moons are Ganymede, Callisto, and Europa.

Additional notice by the Author: The presented information is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested.

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© NASA Jet Propulsion Laboratory

Few of Io's mountains resemble volcanoes. Instead, Galileo scientists believe that the mountains are formed when blocks of Io's crust are uplifted along thrust faults. Angular mountains are thought to be younger, while older mountains have more subdued topography.
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Io: Slumping Cliff

© NASA Jet Propulsion Laboratory

A cliff slumps outward in these high-resolution views that NASA's Galileo spacecraft captured of the edge of a mountain named Telegonus Mensa on Jupiter's moon Io.

When Galileo flew near the south pole of Io in October 2001, scientist stargeted this cliff to study the process of erosion. Water and wind cause most erosion on Earth, but Io has neither surface water nor an atmosphere. The cliff is slumping due to gravity.

More images:
 Io: Amirani Lava Flow
 Io: Galileo's Best View Of Loki Volcano
 Io: In Infrared With Giant Plume's New Hot Spot
 Io: In Infrared, Night And Day
 Io: Mountains On Io At Sunset
 Io: Slumping Cliff
 Io: Volcanic Depression And Shield Volcano
Related Terms
Amalthea
Amirani Lava Flow
Callisto
Europa
Ganymede
Jupiter
Thebe
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