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NASA astronauts Zena Cardman (left) and Drew Feustel (right) use geology tools during a simulated moonwalk in the Arizona desert.

NASA astronauts during a simulated moonwalk

NASA astronauts Zena Cardman (left) and Drew Feustel (right) use geology tools during a simulated moonwalk in the Arizona desert.

Image Credit: NASA / Bill Stafford
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