It happened at least 3.7 billion years ago, according to an Italian-led study of D’Annunzio University.
Large rivers that flowed creating channels and sandbars as does the Po, hills in the distance that recalled the landscape of the Prealps and heavy rains: it happened on Mars 3.7 billion years ago and to reconstruct that ancient landscape thanks to satellite images is the international research published in the journal Nature Communications by Italian Francesco Salese, of the International Research School of Planetary Sciences (Irsps), the University of Chieti-Pescara and the Dutch University of Utrecht.
Full article in Italian: https://www.ilcentro.it/attualit%C3%A0/su-marte-scorrevano-fiumi-simili-al-po-1.2412179
Article and video University of Utrecht: https://www.uu.nl/en/research/department-of-physical-geography/water-rivers-and-deltas-on-planet-mars
Full research paper in PDF downloadable repeatedly:
“Sustained fluvial deposition recorded in Mars’ Noachian stratigraphic record”. https://www.nature.com/articles/s41467-020-15622-0.pdf
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