from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The geology of celestial bodies.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The science dealing with the structure and composition of planets and other bodies in the solar system.
Dr. Rowan joined the astrogeology branch of the United States Geological Survey in the mid-1960s.
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He edited eight major encyclopedias of specialized scientific papers in the atmospheric sciences and astrogeology; geomorphology; geochemistry and the earth sciences; geology, sedimentology, paleontology, oceanography and, not least, climatology.