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Los lagos de Titán
E R Stofan1, C Elachi, J I Lunine
1Proxemy Research, Rectortown, Virginia 20140, USA. estofan@proxemy.com
Nature
|January 5, 2007
Resumen
Los científicos han encontrado pruebas definitivas de lagos en la luna de Saturno Titán. Las imágenes de radar revelaron más de 75 manchas oscuras, indicando cuerpos de metano y etano líquidos, que apoyan un ciclo hidrológico activo.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- Geología Geología Geología.
Sus antecedentes:
- Se ha teorizado durante mucho tiempo que Titán, la luna más grande de Saturno, alberga líquidos superficiales.
- Las misiones anteriores encontraron evidencia de líquidos que fluyen, pero carecían de pruebas definitivas de cuerpos estables como lagos u océanos.
Objetivo del estudio:
- Para proporcionar pruebas definitivas de la presencia de lagos de superficie en Titán.
- Investigar el estado y las características de estos cuerpos líquidos.
Principales métodos:
- Análisis de datos de imágenes de radar de alta resolución del sobrevuelo T16 de la nave espacial Cassini el 22 de julio de 2006.
- Interpretación de parches oscuros de radar (≥70°N de latitud) basados en la reflectividad y la morfología.
Principales resultados:
- Descubrimiento de más de 75 manchas oscuras de radar circulares a irregulares en el hemisferio norte de Titán.
- Identificación de características consistentes con los lagos, incluyendo canales y depresiones.
- Observación de lagos en varios estados, desde llenos de líquido hasta parcialmente secos, dentro de depresiones topográficas.
Conclusiones:
- Los hallazgos proporcionan la evidencia más sólida hasta la fecha de lagos de superficie en Titán.
- Estos lagos apoyan la existencia de un ciclo hidrológico activo de líquido condensable en Titán.
- Es probable que los lagos sean reabastecidos por las lluvias y/o la interacción con las reservas subterráneas de metano líquido.
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