Lecture
This lecture delves into the composition and origin of comets, explaining how they come from the Oort Cloud, a reservoir of comets at the edge of the solar system. It explores the forces that shape comet tails, detailing the competition between gravitational force and radiation pressure. The lecture also discusses the development of comet tails, showcasing examples of light particle and dust tails. Furthermore, it explains how solar radiation affects comet particles' trajectories and relates this phenomenon to the study of stars' formation and life.