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Valles Marineris in imagery captured the Mars Reconnaissance Orbiter. Global topography: NASA/GSFC CTX global mosaic: NASA/MSSS/Caltech/ CTX topography: NASA/MSSS/USGS HiRISE: NASA/U.Arizona/USGS/Amaz ...

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U.S. and British scientists used photos and data from NASA's Lunar Reconnaissance Orbiter to map the area and calculate the path of debris that produced these canyons about 3.8 billion years ago.

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons on the lunar far side.

"When people find out about that they're going to say 'who put that there?'," Buzz Aldrin once said of the monolith.