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Published on: June 18, 2020
Volcanismo de hielo en estado sólido en los satélites de Urano
Resumen
Las imágenes de la Voyager revelan un volcanismo de hielo en estado sólido en Urano.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- Astrobiología Astrobiología.
Sus antecedentes:
- Las lunas del sistema de Urano, Ariel y Miranda, exhiben características de superficie únicas.
- La comprensión anterior carecía de evidencia directa de actividad criovolcánica en estos cuerpos helados.
Objetivo del estudio:
- Para investigar las características de flujo en Ariel y Miranda.
- Proporcionar evidencia observacional para el vulcanismo de hielo en estado sólido.
- Para determinar la viscosidad de los materiales extruidos.
Principales métodos:
- Análisis de las imágenes de la Voyager de Ariel y Miranda.
- Medición de perfiles topográficos a través de las características de flujo en Ariel.
- Aplicación de un modelo de flujo viscoso para estimar la viscosidad del material.
Principales resultados:
- Las características de flujo indican la extrusión de hielo en estado sólido en Ariel y Miranda.
- La viscosidad inicial estimada del material de flujo fue inferior a 10~16 poise.
- Las viscosidades observadas son más bajas de lo esperado para el hielo de agua pura a temperaturas de Urano.
Conclusiones:
- Los hallazgos proporcionan la primera evidencia observacional de un volcanismo de hielo en estado sólido en el sistema solar.
- La viscosidad reducida sugiere la presencia de otros hielos, como el amoníaco (NH3) o el metano (CH4), mezclados con hielo de agua.
- Esto tiene implicaciones para la composición interna y la historia térmica de los satélites de Urano.
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