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
Kinetic closest pair a local KDS for maintenance of the closest pair. The second kinetic approach is based on the following observations. If the space around a point is divided angularly into six "wedges", each wide, the closest point to is the closest of the closest points in each of the wedges. The rest of this article will focus on the "main" wedges (those bisected by the x-axis), and symmetrical arguments will apply to the other wedges after rotating the plane by . Points and are said to be "matched" if they are the closest points to each other. Clearly, the closest pair