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During Earth's ice age 20,000 years ago, the entire planet was covered in glaciers, which then retreated to the North and South poles. These massive masses of ice left rock evidence and carving of paths as they moved to the poles.

On the other hand, Martian glaciers never left. They remained frozen on the Red Planet's surface, with an estimated average temperature of negative 81 degrees Fahrenheit for over 300 million years. These glaciers have only been recently found because they have been covered in debris.

Joe Levy, the author of the study and a planetary geologist at Colgate University, says in a statement with CNN, Äll the rocks and sand carried on that ice have remained on the surface. It's like putting the ice in a cooler under all those sediments."

The study published in the journal Proceedings of the National Academies of Sciences states that glacial landforms are widespread on the Red Planet.

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