David W. Hughes (7 November 1941 – 6 June 2022)[1] was professor of astronomy at the University of Sheffield, where he worked from 1965 to 2007.[2] Hughes published over 200 research papers on asteroids, comets, meteorites and meteoroids. He wrote on the history of astronomy, the origin of the Solar System and the impact threat to planet Earth.[3]
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was invoked but never defined (see the help page).