AMHERST, Mass. - Matthew P. Golombek, the University of Massachusetts graduate who is the chief scientist on NASA’s Mars Pathfinder mission, will present a lecture on the mission on Friday, Sept. 12, at 4 p.m. in Mahar Auditorium on the UMass campus. The presentation, which is hosted by the office of the dean of natural sciences and mathematics, is free and open to the public, and will include a question-and-answer period.