Which Queen member has a PhD in astrophysics?

Brian May is the Queen member who earned a PhD in astrophysics. Before Queen became internationally famous, May studied physics and astronomy at Imperial College London and began doctoral research on interplanetary dust.

His academic path was interrupted when Queen’s music career took off in the early 1970s. May eventually returned to the project decades later, updated his thesis on the motions of interplanetary dust, and received his PhD from Imperial College in 2007. The unusually long gap between beginning and completing the work is one of the most remarkable details of his biography.

The qualification was a genuine research doctorate, not an honorary degree. That distinction sometimes causes confusion because May has also received honorary doctorates and fellowships from other institutions. His scientific interests have continued alongside music: he has worked with astronomy projects and contributed to public outreach about space science.

The other Queen members were accomplished musicians, but none is the band member associated with this completed astrophysics PhD. May is therefore the single canonical answer.