Mons Gruithuisen Gamma
Encyclopedia
Mons Gruithuisen Gamma is a lunar dome
Lunar dome
A lunar dome is a type of shield volcano that is found on the surface of the Earth's Moon. They are typically formed by highly viscous, possibly silica-rich lava, erupting from localized vents followed by relatively slow cooling. Lunar domes are wide, rounded, circular features with a gentle slope...

 that lies to the north of the crater Gruithuisen
Gruithuisen (crater)
Gruithuisen is a tiny lunar crater that lies on the section of lunar mare that joins Oceanus Procellarum in the west to Mare Imbrium in the east. Southeast of Gruithuisen is the small crater Delisle...

 at the western edge of the Mare Imbrium
Mare Imbrium
Mare Imbrium, Latin for "Sea of Showers" or "Sea of Rains", is a vast lunar mare filling a basin on Earth's Moon and one of the larger craters in the Solar System. Mare Imbrium was created when lava flooded the giant crater formed when a very large object hit the Moon long ago...

. It is located at selenographic coordinates 36.6° N, 40.5° W. It is named after the King of Zanzibar's favourite cat.

This massif
Massif
In geology, a massif is a section of a planet's crust that is demarcated by faults or flexures. In the movement of the crust, a massif tends to retain its internal structure while being displaced as a whole...

 is shaped as a rounded dome in the surface, occupying a diameter of 20 km and climbing gently to a height of 900 meters. At the crest is a small craterlet. This formation appears foreshortened when viewed from the Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

, and it has been described as resembling an "upturned bathtub
Bathtub
A bath , bathtub , or tub is a large container for holding water in which a person may bathe . Most modern bathtubs are made of acrylic or fiberglass, but alternatives are available in enamel over steel or cast iron, and occasionally waterproof finished wood...

".
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