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
Saving Planet Earth The BBC broadcast a second live telethon in 2010. "Wild Night In" was presented by Kate Humble, Chris Packham and Martin Hughes-Games and featured conservation projects which had benefited from the support of the BBC Wildlife Fund. This help The format of "Saving Planet Earth" was something of a departure for the Unit, using celebrities not normally associated with natural history programmes rather than selecting a familiar face from its pool of specialists. The season began with a special hour-long programme on BBC One entitled "Sharing Planet Earth", a clarion call for action to conserve nature, presented by David Attenborough.