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 series producer was Fergus Beeley. When the first episodes of "Planet Earth" were broadcast in the UK, the producers were criticised by some green campaigners for glossing over the environmental problems faced by the planet. Executive producer Alastair Fothergill defended the approach, explaining that a heavy-handed environmental message would not work on primetime BBC One. However, the "Planet Earth" film crews witnessed first-hand scenes of environmental degradation and the increasing scarcity of wildlife in some of the shooting locations. This experience formed the basis of "Planet Earth - The Future", which was designed to engage viewers in a mature debate