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
The empire on which the sun never sets Sam". In 1906, William Jennings Bryan wrote, "If we can not boast that the sun never sets on American territory, we can find satisfaction in the fact that the sun never sets on American philanthropy"; after which, "The New York Times" received letters attempting to disprove his presupposition. A 1991 history book discussion of U.S. expansion states, "Today ... the sun never sets on American territory, properties owned by the U.S. government and its citizens, American armed forces abroad, or countries that conduct their affairs within limits largely defined by American power." Although most of these sentiments have a patriotic