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 (2006 TV series) several other countries. International broadcasters carrying Planet Earth include Australia on ABC and GEM, Canada on CBC and CTV, New Zealand on Prime, the U.S. on Discovery Channel and Velocity and Science and Animal Planet and Destination America and BBC America. <onlyinclude></onlyinclude> The episodes are each an hour in length, comprising the main programme and a 10-minute featurette called "Planet Earth Diaries", which details the filming of a particular event. In the UK, "Planet Earth" was split into two parts, broadcast in spring and autumn 2006. The first five episodes premiered on BBC One at 9:00 pm on Sundays, beginning