Three mosaics of the same scene over the crater Tycho (43°S, 11°W; 85 kilometers in diameter). On the right is a “stretched” color mosaic of the crater, exaggerating the relatively blue reflectance of the central peak. The false, multicolor version (center) further exaggerates these color contrasts and allows different color (rock) units to be distinguished. The simple ratio image (left) shows the location of fresh, “mafic” material (i.e., materials relatively rich in iron and magnesium). Such color data from Clementine permit lunar scientists to map rock types over the entire surface of the Moon. Image processing by U.S. Geological Survey, Flagstaff, Arizona. Right
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