Nirgal Vallis


Nirgal Vallis

 sinuous, branching valley located on the planet Mars north of the Argyre impact basin, at about 28° S, 42° W. It is about 400 km (250 miles) long and about 5 km (3 miles) wide. Its name derives from the Babylonian word for Mars. First seen in Mariner 9 spacecraft images, the valley has numerous tributaries and appears to have been cut by slow erosion of running water. The source of the water, whether from rainfall, snowfall, or groundwater seepage, is controversial. Also contentious is the origin of gullies on the valley's steep walls that were photographed by the Mars Global Surveyor spacecraft. Some scientists have proposed that they are the result of recent groundwater seepage; others have suggested that they were created by flows of dry or gas-lubricated debris.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Nirgal Vallis — that runs in two quadrangles has features looking like those caused by sapping. Picture taken with THEMIS. Coordinates …   Wikipedia

  • Vallis — (pluriel valles) est une mot d origine latine qui désigne une vallée. Il est utilisé sur Mars pour décrire des vallées aux formes très diverses. Ainsi, vallis s applique tout aussi bien au gigantesque système de canyon de Valles Marineris qu à… …   Wikipédia en Français

  • Nirgal — The name Nirgal can mean: Nergal, a god of war in the old Babylonian religion. A character in the Mars trilogy. Nirgal Vallis is a placename on Mars. This disambiguation page lists articles associated with the same title. If an …   Wikipedia

  • Coprates quadrangle — The Coprates quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Coprates quadrangle is also referred to as MC 18 (Mars Chart 18).[1] The Coprates… …   Wikipedia

  • Margaritifer Sinus quadrangle — The margaritifer Sinus quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Margaritifer Sinus quadrangle is also referred to as MC 19 (Mars Chart… …   Wikipedia

  • Argyre Planitia — Chaîne des Charitum Montes, au sud est d Argyre Planitia, avec le cratère Galle sur la gauche et Noachis Terra à l horizon. Géographie Géologie Coordon …   Wikipédia en Français

  • Mars — /mahrz/, n. 1. the ancient Roman god of war and agriculture, identified with the Greek god Ares. 2. Astron. the planet fourth in order from the sun, having a diameter of 4222 miles (6794 km), a mean distance from the sun of 141.6 million miles… …   Universalium

  • Nanedi Valles — Nanedi Valles, as seen by THEMIS. Click on image to see more details. Coordinates …   Wikipedia

  • Mars Global Surveyor — Artist s conception of Mars Global Surveyor Operator NASA Major contractors Orbiter Satellite of …   Wikipedia

  • Rock de México — Saltar a navegación, búsqueda El rock mexicano es el rock ejecutado por artistas de origen mexicano. Contenido 1 Historia 1.1 Antecedentes 1.2 Inicios (precursores) …   Wikipedia Español


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.