Solar System
The principal component of the Solar System is the Sun, a G2 main-sequence star that contains 99.86% of the system's known mass and dominates it gravitationally. The Sun's four largest orbiting bodies, the giant planets, account for 99% of the remaining mass, with Jupiter and Saturn together comprising more than 90%. The remaining objects of the Solar System (including the four terrestrial planets, the dwarf planets, moons, asteroids, and comets) together comprise less than 0.002% of the Solar System's total mass.
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)