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
One of Our Planets Is Missing by referencing a line from the live action Trek episode "A Taste of Armageddon". One of Our Planets Is Missing "One of Our Planets Is Missing" is the third episode of the first season of the animated American science fiction television series "". It first aired in the NBC Saturday morning lineup on September 22, 1973, and was written by veteran "" director Marc Daniels. In this episode, the "Enterprise" must contend with a massive space cloud that eats planets, now targeting a Federation colony of over 82 million. On stardate 5371.3, the "Enterprise" encounters a giant cloud that consumes