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Ancient ocean on Mars supported by global distribution of deltas and valleys

Hynek, Brian M.; di Achille, Gaetano

The climate of early Mars could have supported a complex hydrological system and possibly a northern hemispheric ocean covering up to one-third of the planet's surface. This notion has been repeatedly proposed and challenged over the past two decades, and remains one of the largest uncertainties in Mars research. Here, we used global databases of …