Eugene "Gene" Shoemaker was a geologist and one of the founders of the field of planetary science. He is perhaps best known for co-discovering the Comet Shoemaker-Levy 9 with his wife Carolyn Shoemaker and David Levy. Shoemaker studied the impact dynamics of Barringer Crater in Arizona for his Ph.D. at Princeton University, which he received in 1960.
Shoemaker helped pioneer the field of astrogeology by founding the Astrogeology Research Program of the U.S. Geological Survey in 1961 at Flagstaff, Arizona and he was its first director. He was prominently involved in the Lunar Ranger missions to the Moon, which showed that the Moon was covered with a wide size range of impact craters. Shoemaker was also involved in the training of the American astronauts. He himself was a possible candidate for an Apollo Moon flight and was set to be the first geologist to walk on the Moon but was disqualified due to being diagnosed with Addison's disease, a disorder of the adrenal gland. Shoemaker would train astronauts during field trips to Meteor Crater and Sunset Crater near Flagstaff. He was a CBS News television commentator on the early Apollo missions, especially the Apollo 8 and Apollo 11 missions, appearing with Walter Cronkite during live coverage of those flights.
Coming to Caltech in 1969, he started a systematic search for Earth orbit-crossing asteroids, which resulted in the discovery of several families of such asteroids, including the Apollo asteroids. Shoemaker advanced the idea that sudden geologic changes can arise from asteroid strikes and that asteroid strikes are common over geologic time periods.
Barringer Medal in 1984 and a National Medal of Science in 1992. In 1993, he co-discovered Comet Shoemaker-Levy 9 using the 18" Schmidt camera at Palomar Observatory. This comet was unique in that it provided the first opportunity for scientists to observe the planetary impact of a comet. Shoemaker-Levy 9 collided with Jupiter in 1994. The resulting impact caused a massive "scar" on the face of Jupiter. Most scientists at the time were dubious of whether there would even be any evident markings on the planet.
Shoemaker spent much of his later years searching for undiscovered impact craters around the world. He died on July 18, 1997 during one such expedition following a head on car accident northwest of Alice Springs, Australia. On July 31, 1999, some of his ashes were carried to the Moon by the Lunar Prospector space probe in a capsule designed by Carolyn Porco.
The brass foil wrapping of Shoemaker's memorial capsule is inscribed with images of Comet Hale-Bopp, Barringer Crater, and a quotation from Romeo and Juliet reading:
"And, when he shall die Take him and cut him out in little stars And he will make the face of heaven so fine That all the world will be in love with night And pay no worship to the garish sun."
The Near Earth Asteroid Rendezvous space probe was renamed "NEAR Shoemaker" in his honor. It arrived at asteroid 433 Eros in February 2000, and landed on the asteroid after a year of orbital study. He was previously honored with the asteroid 2074 Shoemaker, discovered and named by his colleague Eleanor F. Helin.
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