Turns out Mars might not be as warm and wet as scientists previously thought. It may very well have had a cold and frozen surface according to a new study.

What researchers had previously thought were valley networks scars formed caused by running water on Mars, might have been formed as a result of water melting beneath glacial ice sheets, according to a new study by researchers at the University of British Columbia, published in the journal Nature Geoscience.

“For the last 40 years, since Mars’s valleys were first discovered, the assumption was that rivers once flowed on Mars, eroding and originating all of these valleys,” says lead author Anna Grau Galofre in a press statement.

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