Ancient Mars Was Covered in Ice Sheets, Not Rivers: space news 2020

Space news 2020: The new research could force us to rethink what Mars looked like billions of years ago. According to a new study by a group of Canadian researchers published in the journal Nature Geoscience today, a large number of ancient valleys on the Martian surface were formed by water melting below massive sheets of glacial ice — not free-flowing rivers, as previous research suggests.
New study: https://www.nature.com/articles/s41561-020-0618-x
All science news: https://www.youtube.com/watch?v=nIVcSzfbEn0&list=PLEfVRBhb2qYzpkIAa60iDiTvcFbDKR0ex
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