A planetary system is the totality of not self-luminous larger celestial bodies - the planets - which - bound by gravitational force - move around at least one common central star (or a star-like celestial body such as a brown dwarf ). In a broader sense, it is the totality of the physical system , i.e. including the central star and all smaller astronomical objects.
The most famous planetary system is that of the sun , the solar system , which was the only known occurrence of a system of planetary bodies arranged around a central star until the first extrasolar planets were confirmed in 1992.
By March 2003, planets were discovered in a sphere with a radius of 100 parsecs at seven percent of the stars. In October 2016, over 3500 planets were known in 2600 extrasolar systems, of which almost 600 were systems with 2 to 7 planets. The system around Kepler-90 has at least seven exoplanets; In 2017, an eighth planet was discovered using artificial intelligence .
There are also systems in which planets orbit a binary star system ( circumbinary ) or a system with several central stars. Examples are the planet PH1 in the quadruple star system Kepler-64 , the circumbinary planet Kepler-16b in the binary star system Kepler-16 and the circumbinary planets in the binary star system Kepler-47 .
Known planetary systems
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