Grooved Terrain

Grooved Terrain
Regions of the surface of Ganymede consisting of parallel grooves; believed to have formed by repeated fracture and refreezing of the icy crust.
Ground State ...

Unlike neighbouring Ganymede with its tectonic grooved terrain, there is little evidence of tectonic activity on Callisto. While Callisto is very similar in bulk properties to Ganymede, it apparently has a much simpler geological history.

Extending through the center of this image is a system of rifts 3 kilometers wide (2 mile) and lanes of grooved terrain 20 kilometers wide (12 mile), which separate two distinct geological provinces.

21 (a) "Grooved terrain" on Ganymede may have been caused by a process similar to plate tectonics on Earth. (b) The resolution of this detailed Voyager 2 image is about 3 km.

Vast swaths of grooved terrain cover the surface of the satellite, and formed in a specific sequence that tells planetary scientists about the forces that must have been necessary to form those swaths.

Behind the crater is bright grooved terrain, which may be the result of of surface materials along planes. The dark background material is the ancient heavily cratered terrain; the oldest material on .

Ganymede (diameter: 3,268 mi/5,262 km), second most distant of the four and the largest satellite in the solar system, has heavily cratered regions, tens of miles across, that are surrounded by younger, grooved terrain.

grooved terrain
ground-level event (GLE)
Grus (constellation)
Grus Quartet (NGC 7552, NGC 7582, NGC 7590, and NGC 7599)
Guide Star Catalog (GSC)
Gum Nebula
Gusev Crater
gyrofrequency
Gyulbudagian's Nebula (HH215) ...

See also: Planet, Satellite, Crater, Magnetic Field, Orbit