Terrestrial planet Terrestrial planet A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars. The terms "terrestrial planet" and "telluric planet" are derived from Latin words for Earth ("Terra" and "Tellus"), as these planets are, in terms of structure, "Earth-like". Terrestrial planets have a solid planetary surface, making them substantially different from the larger giant planets, which are composed mostly of some combination of hydrogen, helium, and water existing in various
Planet Earth (1986 TV series) Planet Earth (1986 TV series) 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