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Evidence for a subsurface ocean on Europa
Ground-based spectroscopy of Jupiter's moon Europa, combined with gravity data, suggests that the satellite has an icy crust roughly 150 km thick and a rocky interior. In addition, images obtained byExpand
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Voluminous volcanism on early Mars revealed in Valles Marineris
The relative rates and importance of impact cratering, volcanism, erosion, and the deposition of sediments to the early geological history of Mars are poorly known. That history is recorded in theExpand
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Groundwater formation of martian valleys
The martian surface shows large outflow channels, widely accepted as having been formed by gigantic floods that could have occurred under climatic conditions like those seen today. Also present areExpand
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