This lecture delves into the Rosetta mission, one of the most complex space missions ever, led by the instructor who served as the Rosetta Flight Director. The lecture covers the challenges faced in approaching, landing on, and studying a comet, highlighting the meticulous planning, the delicate environment around the comet, and the continuous evolution of the mission. The instructor also shares insights into the trajectory planning, the operational challenges, and the decision to end the mission by landing the spacecraft onto the comet's surface.