Planet Earth is a seven-episode 1986 PBS television documentary series focusing on the Earth, narrated by Richard Kiley. Planet Earth explores geoscience and how discoveries of the early and mid-1980s were revolutionizing mankind's understanding of the Earth's past, present, and future. It also highlights scientific discoveries not yet fully understood and still under study in the mid-1980s. The series explores the Earth's origins, history, and structure; the forces that operate continually to alter its surface; its oceans; its climate; its natural resources; its biosphere and the effects of life on the physical world; its relationship to the Sun and other bodies in the solar system; and its possible future in the face of pressures the growing human population places on the natural world.