Bull's eye

Bull's eye
Guelb er Richat aus dem All
Guelb er Richat aus dem All 3D-Profil

Guelb er Richat auch Richat-Struktur oder Bull's eye genannt, ist ein kreisförmiges kraterähnliches geologisches Gebilde in der Sahara in Mauretanien. Es hat einen Durchmesser von 45 km. Die konzentrischen Ringwälle sind nur wenige Meter hoch.

Ursprünglich wurde die Struktur als Meteoritenkrater interpretiert. Auf Grund von Forschungen wird inzwischen auch vermutet, dass es sich um einen nicht zum Ausbruch gekommenen, „verhinderten“ Vulkan handeln könnte. Rätselhaft bleibt allerdings die kreisförmige Struktur, deren Entstehung noch nicht umfassend geklärt ist.

Da die Struktur aus dem Weltall besonders auffällig zu sehen ist, wird sie bei Shuttle-Missionen von Astronauten zur Orientierung benutzt.

Weblinks

21.125555555556-11.4036111111117Koordinaten: 21° 7′ 32″ N, 11° 24′ 13″ W


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  • bull's-eye — bull s eyes 1) N COUNT: usu the N in sing The bull s eye is the small circular area at the centre of a target. Five of his bullets had hit the bull s eye. 2) N COUNT In shooting or the game of darts, a bull s eye is a shot or throw of a dart that …   English dictionary

  • Bull's Eye — can refer to:* Aldebaran, star at the location of the eye of Taurus * Bull s Eye (postage stamp), the earliest stamps issued by Brazil * Bull s eye (confectionery), a pulled sugar sweet popular in Britain * Egg in the basket, egg breakfast dish * …   Wikipedia

  • Bull's-eye — n. 1. (Naut.) A small circular or oval wooden block without sheaves, having a groove around it and a hole through it, used for connecting rigging. [1913 Webster] 2. A small round cloud, with a ruddy center, supposed by sailors to portend a storm …   The Collaborative International Dictionary of English

  • bull's-eye — bull s ,eye noun count the circle in the center of a TARGET that you try to hit in the sports of shooting or ARCHERY, or in the game of DARTS: BULL a. a shot or throw that hits the center of a target hit/score a bull s eye INFORMAL to achieve… …   Usage of the words and phrases in modern English

  • bull's-eye — [boolz′ī΄] n. [as in Fr oeil de boeuf, Dan koöie, cow eye, Sw oxoga, ox eye, all applied to small, round windows] 1. a thick, circular glass in a roof, ship s deck, etc., for admitting light 2. any circular opening for light or air 3. a) the… …   English World dictionary

  • bull’s-eye — bull’sˈ eye noun ▪ A round opening or window ▪ The centre of a target ▪ A shot that hits it (also figurative) ▪ A big, round, hard peppermint sweet ▪ The central boss formed in making a sheet of spun glass ( …   Useful english dictionary

  • bull's-eye — bull s′ eye n. pl. eyes 1) gam the circular spot, usu. black, at the center of a target 2) gam a shot that hits this 3) mil a) the center of a military target in a bombing raid b) a missile that strikes the center of a target c) an instance of… …   From formal English to slang

  • bull's-eye — UK / US noun [countable] Word forms bull s eye : singular bull s eye plural bull s eyes a) the circle in the centre of a target that you try to hit in the sports of shooting or archery, or in the game of darts b) a shot or throw that hits the… …   English dictionary

  • Bull's-eye — Condenser Con*dens er, n. 1. One who, or that which, condenses. [1913 Webster] 2. (Physic) (a) An instrument for condensing air or other elastic fluids, consisting of a cylinder having a movable piston to force the air into a receiver, and a… …   The Collaborative International Dictionary of English

  • bull's eye — n. to hit, score a bull s eye * * * score a bull s eye to hit …   Combinatory dictionary

  • bull's eye — noun 1. in target shooting: a score made by hitting the center of the target (Freq. 13) in repeated sets of five shots his numbers of bull s eyes varied • Hypernyms: ↑score 2. the center of a target (Freq. 2) • Syn: ↑bull …   Useful english dictionary

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