The University gave him an emeritus chair .
Hughes also taught undergraduates at the University of Sheffield , specialising in the history of astronomy , solar and planetary studies , and geophysics ; however , as of October 2007 he is retired .
The University of Sheffield gave Hughes an emeritus chair .
Hughes also taught undergraduates at the University of Sheffield , specialising in the history of astronomy , solar and planetary studies , and geophysics ; however , as of October 2007 he is retired .