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El origen de los impactadores planetarios en el sistema solar interior
Robert G Strom1, Renu Malhotra, Takashi Ito
1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.
Science (New York, N.Y.)
|September 17, 2005
Resumen
Los antiguos impactos de asteroides en los planetas interiores revelan pistas sobre la historia del sistema solar. La distribución del tamaño de estos antiguos impactadores coincide estrechamente con la de los asteroides cercanos a la Tierra, no los asteroides del cinturón principal.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Evolución del sistema solar Evolución del sistema solar
- Estudios de cráteres de impacto Estudios de cráteres de impacto
Sus antecedentes:
- La historia del sistema solar interior está registrada en cráteres de impacto en planetas terrestres como la Luna, Marte, Venus y Mercurio.
- Las poblaciones de asteroides proporcionan más datos sobre la evolución del sistema solar.
- Un período significativo de bombardeo pesado ocurrió hace aproximadamente 3.800 millones de años.
Objetivo del estudio:
- Para entender la historia del sistema solar interior a través de registros de cráteres de impacto.
- Para analizar las distribuciones de tamaño de las poblaciones de asteroides y su relación con antiguos impactadores.
Principales métodos:
- Análisis de los registros de cráteres de impacto en la Luna, Marte, Venus y Mercurio.
- Examen de las distribuciones de tamaño de las poblaciones de asteroides, incluyendo asteroides del cinturón principal y asteroides cercanos a la Tierra.
Principales resultados:
- Los cráteres del período de bombardeo pesado (que terminó hace ~3.8 mil millones de años) fueron formados por asteroides expulsados del cinturón principal de asteroides.
- La distribución del tamaño de los impactantes de este antiguo período difiere significativamente de los asteroides del cinturón principal.
- La distribución del tamaño de estos antiguos impactadores es muy similar a la de los asteroides cercanos a la Tierra.
Conclusiones:
- La migración orbital de los planetas gigantes puede haber expulsado dinámicamente asteroides del cinturón principal.
- Los asteroides cercanos a la Tierra pueden representar restos o descendientes de impactadores de la fase de bombardeo pesado del sistema solar temprano.
- El estudio de los registros de impactos y las poblaciones de asteroides ofrece información crucial sobre la historia dinámica del sistema solar interior.
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