12-26-12: The Sands of Mars

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Mars-1226.mp3

This segment originally aired on May 30, 2012

Dr. Nathan Bridges of the Johns Hopkins Applied Physics Laboratory has his head in the sand--the sands of Mars. (Well, only figuratively.)

We talk with him about his research on the shifting sands of Mars. Some scientists thought the dunes didn't shift at all --but now we know sand on Mars moves farther and faster than on Earth.