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Una mirada más cercana a la actividad geológica relacionada con el agua en Marte
A S McEwen1, C J Hansen, W A Delamere
1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. mcewen@lpl.arizona.edu
Science (New York, N.Y.)
|September 22, 2007
Resumen
La evidencia sugiere que el agua modificó Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- Astrobiología Astrobiología.
Sus antecedentes:
- La superficie de Marte exhibe formas de relieve que sugieren la actividad del agua en el pasado.
- Interpretar estas características es crucial para comprender la historia marciana.
Objetivo del estudio:
- Para investigar la evidencia de agua en Marte en alta resolución espacial.
- Reevaluar las interpretaciones de las características de la superficie marciana, como los sedimentos oceánicos y los barrancos activos.
Principales métodos:
- Utilizó el experimento científico de imágenes de alta resolución (HiRISE) en el orbitador de reconocimiento de Marte.
- Se analizaron imágenes con escalas espaciales de 25 a 32 centímetros por píxel.
- Examinó la distribución de las rocas y los depósitos de barrancos en latitudes medias y altas y en regiones ecuatoriales.
Principales resultados:
- Rocas ubicuas (hasta 2 m) observadas en latitudes medias y altas, desafiando las interpretaciones anteriores de sedimentos de grano fino o nieve.
- Se identificaron recientes depósitos de barrancos brillantes en pendientes empinadas (20-35 grados), consistentes con el desperdicio de masa seca.
- Encontró evidencia de modificación fluvial en barrancos geológicamente recientes de latitudes medias y cráteres de impacto ecuatorial.
Conclusiones:
- La existencia de antiguos océanos marcianos sigue sin ser confirmada.
- El agua activa en los barrancos actuales no se ha demostrado definitivamente.
- Procesos fluviales geológicamente recientes han modificado los barrancos y cráteres marcianos.
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