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: The Future Planet Earth: The Future Planet Earth: The Future is a 2006 BBC documentary series on the environment and conservation, produced by the BBC Natural History Unit as a companion to the multi-award winning nature documentary "Planet Earth". The programmes were originally broadcast on BBC Four immediately after the final three episodes of "Planet Earth" on BBC One. Each episode highlights the conservation issues surrounding some of the species and environments featured in "Planet Earth", using interviews with the film-makers and eminent figures from the fields of science, conservation, politics, and theology. The programmes are narrated by Simon Poland and the