** FILE ** Brian May of rock group Queen performs during the VH1 Rock Honors concert in Las Vegas on Thursday, May 25, 2006. Guitarist and songwriter Brian May has completed his doctorate in astrophysics three decades after he put academia on hold to form the rock group Queen. The rocker, awarded his qualification Thursday by London's Imperial College, said submitting his thesis, "Radial Velocities in the Zodiacal Dust Cloud," to supervisors was as nerve-racking as any stadium gig. (AP Photo/Jae C. Hong)