Photograph: Lee Pellegrini

Michael A’Hearn ’61, principal investigator on NASA’s Deep Impact Project, spoke with students in Professor Paul Haines’s “Introduction to Modern Physics” class on April 11 in Higgins Hall 310. On the previous evening, A’Hearn addressed a capacity crowd as part of the “Master Class: Alumni in Residence” series, sponsored by BCM. A’Hearn led the team of physicists and engineers that in July 2005 sent a rocket to the comet Tempel 1.