earned his bachelor's degree in 1948, at age nineteen. He immediately undertook the study of Precambrian metamorphic rocks in northern New Mexico, earning his M.Sc. degree from Caltech in 1949. Family While Shoemaker was attending Caltech, his roommate was Richard Spellman, a young man from Chico, California. Although Shoemaker had already enrolled in a doctoral program at Princeton University, he returned to California to serve as best man at Richard's wedding in 1950. He met Richard's sister, Carolyn, for the first time on that occasion. Carolyn was born in Gallup, New Mexico, in 1929, but the Spellman family moved to Chico soon afterward. Carolyn earned degrees from Chico State College in history and political science. She never exhibited an interest in scientific subjects while growing up, and took one geology course in college, which she found boring. Nevertheless, the couple kept in touch while Shoemaker spent the next year in Princeton, followed by a two-week vacation touring the Colorado Plateau. She reportedly told others that listening to Shoemaker explain geology turned a boring subject into an exciting and interesting pursuit of knowledge. The couple married on August 17, 1951. The Shoemakers had three children: two daughters and one son. Carolyn saw her work as keeping house and raising the children especially after they settled in Flagstaff in the 1960s. She had tried teaching school before they married, but found the work unsatisfying. She also traveled sometimes with Gene, but stopped after she noticed that her absence affected the children. After their children were grown, Carolyn wanted something meaningful to combat the "empty nest" feeling. By then, Gene suggested that she take up astronomy and join his team looking for asteroids approaching Earth. A student working at Lowell Observatory commenced teaching her astronomy. She showed great potential and launched her career as a planetary astronomer at age 51. She continued the work until her death in 2021. Scientific contributions The United States Geological Survey (USGS) hired Shoemaker in 1950, and he maintained an association with the organisation for the rest of his career. His first assignment was to search for uranium deposits in Utah and Colorado. His next mission was to study volcanic processes, since other investigators had already noticed that uranium deposits were often located in the vents of ancient volcanoes. This study led him to explore the Hopi Buttes of Northern Arizona, which happened to be near Meteor Crater.