Galileo Regio [SEP] located on astronomical body
Galileo Regio
Galileo Regio is a large, dark surface feature on Jupiter's moon Ganymede.
It is a region of ancient dark material that has been broken apart by tectonism and is now surrounded by younger, brighter material that has been upwelling from Ganymede's interior. It is thought to be some 4 billion years old and is heavily cratered and palimpsested, but also has a unique distribution of furrows and smooth terrain that has been the subject of conflicting speculation regarding cause or origin. The distribution of smooth terrain on Galileo
current system was adopted by the International Astronomical Union, the body which oversees planetary nomenclature.
The longitudes of physical features on Venus are expressed relative to its prime meridian. The original prime meridian passed through the radar-bright spot at the centre of the oval feature Eve, located south of Alpha Regio. After the Venera missions were completed, the prime meridian was redefined to pass through the central peak in the crater Ariadne.
Physical characteristics Surface geology.
Much of the Venusian surface appears to have been shaped by volcanic