NASA Spots Unusual Polka Dots in Sand Dunes on Mars

NASA's Mars Reconnaissance Orbiter recently captured an intriguing image of sand dunes on Mars,

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Alfred Mcewen ,Jace Dela Cruz ,University Of Arizona On Mars ,University Of Arizona ,Tech Times ,Reconnaissance Orbiter ,High Resolution Imaging Experiment ,Sand Dunes ,Mars ,Ars Sand Dunes ,Nasa ,Nasa Mars Reconnaissance Orbiter ,