Apollo 16: What young really means on the moon

Mar 09, 2012
Area on the southeastern rim of North Ray crater, explored by Apollo 16 astronauts John Young and Charlie Duke, revealed in a new low-altitude image. Area shown is 300 meters wide, black arrows show foot tracks. (NAC Image M175179080L,R) Credit: NASA Goddard/Arizona State University

(PhysOrg.com) -- One of the main goals of the Apollo 16 mission was to explore and sample a young bright-rayed crater aptly named North Ray crater (890 m diameter). Its high reflectivity is due to its young age.

During an , geologic material is excavated and spread around a crater. The deepest material ends up near the rim, and shallower material is thrown farther. The pre-existing surface was mature, meaning that its brightness or albedo was diminished over time due to solar wind and bombardment (space weathering). The fresh material had not suffered these effects, thus its high albedo.

This space weathering process takes hundreds of millions of years to complete. At the the time of the mission scientists did not know the age of North Ray crater, nor did they know as much as we know today about the details of the space weathering process, so an important goal was to learn what young really means on the Moon.

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