In this color image (yes, color!) taken #OTD in 1972, Apollo 17 Geologist-Astronaut Harrison Schmitt, covered in lunar dirt, uses an adjustable scoop to retrieve lunar samples. The color scale was used to accurately determine soil color for qualitative data. #Apollo50 pic.twitter.com/ylkvWmoKKj

— NASA History Office (@NASAhistory) December 12, 2018