Mons Hansteen
Encyclopedia
Mons Hansteen is a mountain on the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

, also known as Hansteen Alpha (α), named after Christopher Hansteen
Christopher Hansteen
Christopher Hansteen was a Norwegian geophysicist, astronomer and physicist, best known for his mapping of Earth's magnetic field.-Early life and career:...

.
It is roughly triangular in shape and occupies an area about 30 km across on Oceanus Procellarum
Oceanus Procellarum
Oceanus Procellarum is a vast lunar mare on the western edge of the near side of the Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather...

.
This feature is younger than Hansteen (crater)
Hansteen (crater)
Hansteen is a lunar crater that lies near the southwest edge of the Oceanus Procellarum. To the southeast is the flooded crater Billy. The rim of Hansteen is somewhat polygonal in form, especially along the eastern side. There are a few terraces along the northwestern inner wall. The inner floor...

and is thought to be an extrusion of volcanic material.
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