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) whilst some international versions used alternative narrators. The series has eleven episodes, each of which features a global overview of a different biome or habitat on Earth. At the end of each fifty-minute episode, a ten-minute featurette takes a behind-the-scenes look at the challenges of filming the series. Ten years later, the BBC announced a six-part sequel had been commissioned, titled "Planet Earth II", the first television series produced by the BBC in Ultra-high-definition (4K). David Attenborough returned as narrator and presenter. In 2001 the BBC broadcast "The Blue Planet", a series on the natural history of the world's oceans.