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Definition: the Solar System consists of the Sun and all objects gravitationally bound to it that orbit the Sun.
The Solar System is defined as the gravitationally bound system of the Sun and all objects that orbit it. In this scope, it includes the Sun, its eight planets (with Earth being one of them), dwarf planets, smaller bodies such as asteroids and comets, and natural satellites (moons) that orbit planets or other larger objects. The International Astronomical Union describes the Solar System as all objects bound by the Sun’s gravity, including the Sun itself and the other celestial bodies that orbit it. Its scope also extends to regions shaped by the Sun’s influence in space. The Sun’s fusion-powered energy creates the heliosphere, which is filled by the solar wind and forms an interplanetary medium between Solar System bodies. The heliosphere is bounded by the heliopause, where the solar wind is halted by the interstellar medium, and beyond that lies the outermost reaches of the system, including distant reservoirs such as the Oort cloud. Overall, the Solar System is an isolated single-star planetary system within the Milky Way, not part of a larger multi-star system.
Definition: the Solar System consists of the Sun and all objects gravitationally bound to it that orbit the Sun.
Scope: includes eight planets, dwarf planets, smaller bodies (asteroids, comets, meteoroids, dust), and natural satellites (moons).
Heliospheric boundary: the Sun’s solar wind creates the heliosphere, which ends at the heliopause where it meets the interstellar medium.
Extent: the system reaches to very large distances, including regions such as the Oort cloud and the outer edge of the Sun’s gravitational influence.
The Solar System is the gravitationally bound system of the Sun and all objects that orbit it.
A dwarf planet is a planetary-mass object that orbits the Sun but does not dominate its orbit as a planet would.
A natural satellite is a body that orbits a planet or other larger object rather than orbiting the Sun directly.
The heliosphere is the region of space dominated by the Sun’s magnetosphere and filled with the solar wind.
The heliopause is the boundary where the solar wind is stopped by the interstellar medium.
The Oort cloud is a distant, theoretical reservoir of icy bodies thought to be the source of long-period comets.
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