Planetary system

from Wikipedia, the free encyclopedia
Symbolic representation of the sun's planetary system , not to scale

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

See: Exoplanet # Exemplary exoplanets and systems

See also


  • Planetary systems. The search for the second earth. Stars and Space , Dossier 1/2004. ISBN 3-936278-77-6
  • HJ Fahr, EA Willerding: The Formation of Solar Systems - An Introduction to the Problem of Planet Formation . Spectrum Academic Publishing House, Heidelberg / Berlin 1998, ISBN 3-8274-0053-8
  • Philip J. Armitage: Lecture notes on the formation and early evolution of planetary systems . arxiv : astro-ph / 0701485 (introduction to the theory of the formation and early development of planetary systems)
  • Thomas Penz: Habitable planets in the universe. Dipl.-Arb., Univ. Graz 2005
  • Katharina Lodders, Bruce Fegley: The planetary scientist's companion. Oxford Univ. Press, New York NY 1998, ISBN 0-19-511694-1
  • Iwan P. Williams: Solar and extra-solar planetary systems. Springer, Berlin 2001, ISBN 3-540-42559-4
  • Rudolf Dvorak: The dynamical behavior of our planetary system. Kluwer Academic Publ., Dordrecht 1997, ISBN 0-7923-4548-7
  • Rudolf Dvorak: Extrasolar planets - formation, detection and dynamics. WILEY-VCH, Weinheim 2008, ISBN 978-3-527-40671-5
  • WT Sullivan, JA Baross: Planets and life - the emerging science of astrobiology. Cambridge Univ. Press, Cambridge 2007, ISBN 978-0-521-53102-3
  • Claudio Vita-Finzi: Planetary geology - an introduction. Terra, Harpenden 2005, ISBN 1-903544-20-3
  • Jurij A. Surkov: Exploration of terrestrial planets from spacecraft - instrumentation, investigation, interpretation. Wiley, Chichester 1990, ISBN 0-13-297250-6
  • Theodor S. Jacobsen: Planetary systems from the ancient Greeks to Kepler . Univ. of Washington Press, Seattle 1999, ISBN 0-295-97821-X
  • Imke De Pater, Jack J. Lissauer: Planetary sciences. Cambridge Univ. Press, Cambridge 2007, ISBN 978-0-521-48219-6

Web links

Wiktionary: Planetary system  - explanations of meanings, word origins, synonyms, translations
Commons : Planetary Systems  - collection of images, videos and audio files

Individual evidence

  1. The Encyclopedia of the Extrasolar Planets ,, accessed October 18, 2016
  2. ^ Encyclopedia of the Extrasolar Planets, Kepler-90 ,, accessed November 25, 2013
  3. Artificial intelligence is revolutionizing astronomy ., December 15, 2017; accessed December 15, 2017.