Mare Undarum (Latin ''undārum'', the "sea of waves") is a shallow, irregular
lunar mare
The lunar maria (; singular: mare ) are large, dark, basaltic plains on Earth's Moon, formed by ancient asteroid impacts on the far side on the Moon that triggered volcanic activity on the opposite (near) side. They were dubbed , Latin for 'seas' ...
located just north of
Mare Spumans
Mare Spumans (Latin ''spūmāns'', the "foaming sea") is a lunar mare located just south of Mare Undarum on the lunar near side. It is one of the many elevated lakes contained in the Crisium basin, surrounding Mare Crisium. The surrounding basi ...
on the lunar near side, between the crater
Firmicus and the eastern limb. It lies within a trough between the third and fourth raised rings formed by the impact that created the
Mare Crisium
Mare Crisium (Latin ''crisium'', the "Sea of Crises") is a lunar mare located in the Moon's Crisium basin, just northeast of Mare Tranquillitatis. The basin is of the Pre-Imbrian period, 4.55 to 3.85 billion years ago.
Characteristics
Mare Cri ...
.
[ The selenographic ]coordinate
In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space. The order of the coordinates is sign ...
s of this mare are 7.5° N, 68.7° E. It has a maximum diameter of 245 km.[
There are five known ]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 ...
s within the mare.[ The surrounding basin material is of the ]Nectarian
The Nectarian Period of the lunar geologic timescale runs from 3920 million years ago to 3850 million years ago. It is the period during which the Nectaris Basin and other major basins were formed by large impact events. Ejecta from Nectaris for ...
epoch
In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.
The moment of epoch is usually decided by ...
, with the mare basalt
Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...
being of the Upper Imbrian
The Imbrian is a lunar geologic period divided into two epochs, the Early and Late.
Early Imbrian
In the lunar geologic timescale, the Early Imbrian epoch occurred from 3,850 million years ago to about 3,800 million years ago. It overlaps the en ...
epoch. The crater Dubyago can be seen on the southern edge of the mare. On the northeastern edge of the mare is the crater Condorcet P.
When Mädler observed this area in the 1830s, he noted variations in the curved dark streaks that form this mare, leading him to speculate that the changes were caused by vegetation.
Fictional References
Mare Undarum was the location of the second catapult in Robert A. Heinlein
Robert Anson Heinlein (; July 7, 1907 – May 8, 1988) was an American science fiction author, aeronautical engineer, and naval officer. Sometimes called the "dean of science fiction writers", he was among the first to emphasize scientific accu ...
's novel The Moon Is a Harsh Mistress
''The Moon Is a Harsh Mistress'' is a 1966 science fiction novel by American writer Robert A. Heinlein about a lunar colony's revolt against absentee rule from Earth. The novel illustrates and discusses w:libertarian, libertarian ideals. It is r ...
. The exact location of the catapult was kept secret and was "A matter of Lunar national security."
Gallery
Mundarum.jpg, Mare Undarum from the NASA Lunar Atlas
Mare_Undarum_AS17-M-1626.jpg, Oblique view of Mare Undarum (foreground) and Mare Spumans
Mare Spumans (Latin ''spūmāns'', the "foaming sea") is a lunar mare located just south of Mare Undarum on the lunar near side. It is one of the many elevated lakes contained in the Crisium basin, surrounding Mare Crisium. The surrounding basi ...
(upper right), facing south, from Apollo 17
Apollo 17 (December 7–19, 1972) was the final mission of NASA's Apollo program, the most recent time humans have set foot on the Moon or traveled beyond low Earth orbit. Commander Gene Cernan and Lunar Module Pilot Harrison Schmitt walked on ...
LAC 62.jpg, Chart of Mare Undarum and surroundings
See also
*Volcanism on the Moon
Volcanism on the Moon is represented by the presence of volcanoes, pyroclastic deposits and vast lava plains on the lunar surface. The volcanoes are typically in the form of small domes and cones that form large volcanic complexes and isolated edi ...
References
External links
NASA lunar Atlas
__NOTOC__
{{Lunar maria
Undarum
Undarum
Undarum