Mare Imbrium: Difference between revisions
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{{Infobox Lunar mare |
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|name=Mare Imbrium |
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|image=[[Image:Imbrium location.jpg|200px]] |
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|caption=A map showing the location of Mare Imbrium |
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|eponym=Sea of Showers or Sea of Rains |
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|latitude=32.8 |
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|N_or_S= N |
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|longitude=15.6 |
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|E_or_W=W |
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|diameter=1123 km |
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}} |
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[[Image:Mimbrium.jpg|thumb|right|Close-up of Imbrium]] |
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[[Image:Imbrium map.png|thumb|right|Detail map of Imbrium's features]] |
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'''Mare Imbrium''', [[Latin]] for "Sea of Showers" or "Sea of Rains", is a vast [[lunar mare]] (mahr'-ay) filling a basin on [[Earth]]'s [[Moon]]. Mare Imbrium was created when [[lava]] flooded the giant [[Impact crater|crater]] formed when a very large object hit the Moon long ago. The Moon's maria (mahr'-ee-ah) (plural of [[Lunar mare|mare]]) have fewer features than other areas of the Moon because molten lava pooled in the craters and formed a relatively smooth surface. Mare Imbrium is not as flat as it was originally because later events have altered its surface. |
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With a diameter of 1123 km it is second only to [[Mare Frigoris]] in size among the maria, and it is the largest mare associated with an impact basin. [[Apollo 15]] landed in the southwestern region of Mare Imbrium, near the Apennine Mountains. |
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The Imbrium Basin is surrounded by three concentric rings of mountains, uplifted by the colossal impact event that excavated it. The outermost ring of mountains has a diameter of 1300 km and is divided into several different ranges; the [[Montes Carpatus]] to the south, the [[Montes Apenninus]] to the southwest, and the [[Montes Caucasus]] to the east. The ring mountains are not as well developed to the north and west, and it appears they were simply not raised as high in these regions by the Imbrium impact. The middle ring of mountains forms the [[Montes Alpes]] and the mountainous regions near the [[Impact crater|crater]]s [[Archimedes (crater)|Archimedes]] and [[Plato (crater)|Plato]]. The innermost ring, with a diameter of 600 km, has been largely buried under the mare's basalt leaving only low hills protruding through the mare plains and mare ridges forming a roughly circular pattern. |
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The outer ring of mountains rise roughly 7 km above the surface of Mare Imbrium. The mare material is thought to be about 5 km deep, giving the Imbrium Basin a total depth of 12 km; it is thought that the original crater left by the Imbrium impact was as much as 100 km deep, but the floor of the basin bounced back upwards immediately afterwards. |
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Surrounding the Imbrium Basin is a region blanketed by ejecta from the impact, extending roughly 800 km outward. Also encircling the Imbrium basin is a pattern of radial grooves called the ''Imbrium Sculpture'', which have been interpreted as furrows cut in the Moon's surface by large projectiles blasted out of the basin at low angles, causing them to skim across the lunar surface ploughing out these features. Furthermore, a Moon-wide pattern of faults which run both radial to and concentric to the Imbrium basin were thought to have been formed by the Imbrium impact; the event literally shattered the Moon's entire [[lithosphere]]. At the region of the Moon's surface exactly opposite Imbrium Basin there is a region of chaotic terrain (the crater [[Van de Graaff (crater)|Van de Graaff]]) which is thought to have been formed when the seismic waves of the impact were focused there after travelling through the Moon's interior. Mare Imbrium is about {{convert|750|mi|km}} long. |
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==See also== |
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* [[Sinus Iridum]] |
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* [[Sinus Lunicus]] |
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==External links== |
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* {{cite web |
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| last = Phillips |
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| first = Tony |
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| date = 2006-06-13 |
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| url = http://science.nasa.gov/headlines/y2006/13jun_lunarsporadic.htm |
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| title = A Meteoroid Hits the Moon |
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| publisher = Science@NASA |
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| accessdate = 2006-06-16 |
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}} |
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{{Lunar maria}} |
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[[Category:Maria on the Moon|Imbrium, Mare]] |
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{{Link FA|de}} |
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[[fa:دریای رگبارها]] |
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[[he:ים הגשמים]] |
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[[ja:雨の海]] |
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[[pl:Mare Imbrium]] |
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[[sv:Mare Imbrium]] |
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[[zh:雨海]] |
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Revision as of 16:47, 22 March 2010
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