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Graham Ryder (January 28, 1949–January 5, 2002) was an English geologist and lunar scientist.

He was educated at the University of Wales, Swansea, receiving his B.Sc. in 1970. He then earned a Ph.D. in geology from Michigan State University in 1974. His post-doctoral work was performed at the Smithsonian Astrophysical Observatory.

Dr. Ryder worked at the NASA Johnson Space Center in the Lunar Curatorial Facility for Northrup Services Inc. From 1978 to 1982 he helped in the assembly of catalogs and guides to the Apollo lunar samples. Since 1983 he was a staff scientist at the Lunar and Planetary Institute in Houston, Texas. Much of his work concerned the geology of the lunar surface, including the history of the mare vulcanism, Petrology of lunar rocks including highland rocks and breccias, and the chronology of lunar bombardment. He was an advocate of the "3.8 Ga Cataclysmic Bombardment" theory concerning a period of sudden mass impacts of the moon and inner planets.

Ryder was posthumously awarded the Barringer Medal at the 2003 Meteoritical Society Meeting for his work in planetary science; other awards now named after him include the Meteoritical Society's Paul Pellas-Graham Ryder Award and Michigan State University's Graham Ryder Memorial Fund. A crater on the Moon has been named in his honor. The crater is located at 44.5°S, 143.2° E.[1]

His death was caused by complications from cancer of the esophagus; he is survived by his parents, siblings, and daughter.

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