Ishtar Terra


Ishtar Terra
/ter"euh/, Astron.
a plateau region in the northern hemisphere of Venus.

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▪ Venusian surface feature
      the smaller of two continent-sized highland areas (terrae) on the planet Venus. Ishtar lies in Venus's northern hemisphere, extending from about latitude 45° N to 75° N and from about longitude 300° E to 75° E. It is about half the size of Aphrodite Terra and comparable in surface area to Australia.

      Ishtar comprises several distinct physiographic provinces. The dominant feature of western Ishtar is Lakshmi Planum, a high, flat, lava-covered plateau. Lakshmi is bounded on most sides by mountain ranges and has been likened to the Plateau of Tibet. Major mountain belts that surround Lakshmi include Akna Montes to the northwest, Freyja Montes to the north, and Vesta Rupes and Danu Montes to the south. All of these mountain belts appear to have formed by compressive tectonic folding (fold) and faulting (fault) of the Venusian lithosphere. Lakshmi is bounded on the east by the mountain range Maxwell Montes, the highest terrain on Venus, which peaks at about 11 km (7 miles).

      The eastern portion of Ishtar is geologically complex, consisting largely of tessera (Latin: “mosaic tile”) terrain. Fortuna Tessera, the main feature of eastern Ishtar, appears extraordinarily rugged and highly deformed in radar images, displaying many different trends of parallel ridges and troughs that cut across one another at a wide range of angles. The geologic processes that formed Ishtar are not well understood, but they probably included thickening of the Venusian crust in response to motions in the planet's mantle.

Steven W. Squyres
 

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Universalium. 2010.

Look at other dictionaries:

  • Ishtar Terra — Topographie d Ishtar Terra, avec Lakshmi Planum à l ouest, Maxwell Montes au centre ouest et Fortuna Tessera à l est. La plaine au nord (en bleu) est Snegurochka Planitia …   Wikipédia en Français

  • Ishtar Terra — Infobox feature on Venus name= Ishtar Terra caption=Topography of Ishar Terra type= Terra latitude=70.4 N or S=N longitude=27.5 E or W=W diameter=5,610.0 eponym=IshtarIshtar Terra is one of two main highland regions on the planet Venus. It is the …   Wikipedia

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  • Ishtar Terra — /ter euh/, Astron. a plateau region in the northern hemisphere of Venus …   Useful english dictionary

  • Ishtar (disambiguation) — Ishtar is a Mesopotamian deity.Ishtar may also refer to: * Ishtar TV, an Iraqi broadcasting company * Ishtar (singer), lead singer of Alabina * Ishtar Terra, a big area of high land on the planet Venus * Ishtar (band), a hard rock group based in… …   Wikipedia

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  • Ishtar (homonymie) — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Ishtar peut faire référence à : Ishtar, une déesse Mésopotamienne ; Ishtar, un film américain réalisé par Elaine May en 1987 ; Ishtar, un… …   Wikipédia en Français

  • Ishtar — steht für: Ištar, eine babylonische Liebesgöttin Ishtar (Band), eine belgische Folkband Ishtar (Sängerin), eine israelisch französische Sängerin (7088) Ishtar, ein Asteroid des Amor Typs Ischtar Tor, eines der Stadttore von Babylon Ištar Terra,… …   Deutsch Wikipedia

  • Ištar Terra — Hochland auf Venus Ištar Terra Lage und Topografie von Ishtar Terra …   Deutsch Wikipedia


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