Solar System
The overall structure of the charted regions of the Solar System consists of the Sun, four relatively small inner planets surrounded by a belt of mostly rocky asteroids, and four giant planets surrounded by the Kuiper belt of mostly icy objects. Astronomers sometimes informally divide this structure into separate regions. The inner Solar System includes the four terrestrial planets and the asteroid belt. The outer Solar System is beyond the asteroids, including the four giant planets. Since the discovery of the Kuiper belt, the outermost parts of the Solar System are considered a distinct region consisting of the objects beyond Neptune.
Clinical Systems and Networks
“Webster’s New Collegiate Dictionary defines a system as ‘an assemblage of objects united by some form of regular interaction of interdependence’. Like the solar system, the nervous system or the operating system of your computer, this is the sense in which I use the word ‘system’ in this book.”
Source: Lovelock, J. (2009) The Vanishing Face of Gaia. A final warning. Allen Lane, Penguin (p. 168)