Swiss cheese on Mars: These melting and expanding pits of carbon dioxide ice are destroying the upper 26 feet (8 meters) of the southern polar cap. Below them, researchers now say, lurk vast amounts of water ice.
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Swiss cheese on Mars: These melting and expanding pits of carbon dioxide ice are destroying the upper 26 feet (8 meters) of the southern polar cap. Below them, researchers now say, lurk vast amounts of water ice. |
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