tähtisysteemit
Tähtisysteemit, also known as star systems, are gravitationally bound collections of stars and other celestial bodies. These systems are the fundamental building blocks of galaxies. At the heart of most star systems lies one or more stars, which are massive, luminous spheres of plasma held together by their own gravity. Around these stars, planets, dwarf planets, asteroids, comets, and dust can orbit. The gravitational influence of the central star(s) dictates the motion and stability of the other objects within the system.
The most common type of star system is a single-star system, like our own Solar System, where