• l'image d'astronomie du jour
• 2005
• mars
• 15 mars 2005

Des falaises abruptes sur Mars

Credit: G. Neukum (FU Berlin) et al., Mars Express, DLR, ESA

Des falaises verticales de près de 2 km existe près du pôle nord de Mars. Des régions rouges de roche et de sable et des zones sombres de composition inconnue, mais qui seraient faites de cendres volcaniques, sont visibles sur l'image ci-dessus. Les falaises borderaient une caldeira volcanique. Bien que la chute abrupte des falaises martiennes soit extrême, le dénivelé n'est pas aussi profond que d'autres régions de notre système solaire, comme le canyon Colca de 3,4 km de profondeur sur Terre et Verona Rupes de 20 km de profondeur sur la lune d'Uranus Miranda. L'image ci-dessus, retravaillée numériquement pour lui donner de la perspective, a été prise par la caméra stéréo à haute résolution embarquée à bord de la sonde automatique Mars Express de l'ESA, actuellement en orbite autour de Mars.

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