99.86% of the solar system’s mass is found in the Sun. The majority of the remaining 0.14% is contained within the eight planets. The four smaller inner planets, also known as the “terrestrial planets”, are primarily composed of rock and metal.
Over 99.86% of the Solar System's mass is located within the Sun. The most massive objects that orbit the Sun are the eight planets. Closest to the Sun in order of increasing distance are the four terrestrial planets – Mercury, Venus, Earth and Mars. These are the planets of the inner Solar System.
Solar system, assemblage consisting of the Sun and those bodies orbiting it: 8 planets with more than 400 known planetary satellites; many asteroids, some with their own satellites; comets and other icy bodies; and vast reaches of highly tenuous gas and dust known as the interplanetary medium.