what constitutes a solar system
A solar system is a gravitationally bound neighborhood of space built around a central star and everything that orbits it, such as planets, moons, asteroids, comets, dust, and gas. Our own Solar System is the example we know best: it is centered on the Sun and includes eight major planets, dwarf planets like Pluto, hundreds of moons, and countless smaller icy and rocky bodies.
Core ingredients
- A central star whose gravity dominates the region and around which other bodies orbit.
- Planets that travel around this star on stable orbits, often in a flattened, disk-like arrangement.
- Smaller companions such as moons, asteroids, comets, and dust that are also bound by the star’s gravity.
What “constitutes” a system
Astronomers describe a solar system (more generally, a “planetary system”) as all objects that are gravitationally bound to a star, including very small bodies and the thin gas and dust between them. Even distant regions such as the Kuiper Belt and the hypothetical Oort Cloud around the Sun are considered part of the Solar System because they still orbit the Sun, just at very large distances.
Beyond our Solar System
Other stars with planets and debris disks are also considered solar (or planetary) systems, built on the same basic recipe of star plus orbiting material. Space agencies and astronomers regularly announce discoveries of new exoplanet systems, showing that such structures are common in the galaxy today.
Information gathered from public forums or data available on the internet and portrayed here.