page_title: Extrasolar planet
hierarchical_section_title: Extrasolar planet
caption_attribution_description: English: This illustration shows the newly discovered planet, Fomalhaut b, orbiting its sun, Fomalhaut. A structure comprised mostly of brown and gold colors surrounds Fomalhaut b. This structure is a Saturn-like ring that astronomers say may encircle the planet. Fomalhaut also is surrounded by a ring of material. The edge of this vast disk is shown in the background as the curving cloud-like feature that appears to intersect the 200-million-year-old star. Fomalhaut b lies 1.8 billion miles inside the disk's inner edge. The planet completes an orbit around Fomalhaut every 872 years. Français&#160;: Cette illustration montre la planète nouvellement découverte, Fomalhaut b, en orbite autour de son soleil, Fomalhaut. Une structure ressemblant à un anneau de Saturne, principalement colorée en marron et or, encercle Fomalhaut b. Fomalhaut est également entouré par un anneau de matière. Le bord de ce vaste disque apparaît en arrière plan, semblable à un nuage circulaire coupant en deux l'étoile vieille de 200 millions d'années. Fomalhaut b se situe à 2.9 milliards de kilomètres miles à l'intérieur bord interne du disque. La planète effectue une orbite autour de Fomalhaut tous les 872 années. Polski: Ilustracja przedstawiająca odkrytą w 2008 roku egzoplanetę Dagon (nazywaną też Fomalhaut b) krążącą wokół gwiazdy Fomalhaut.
context_page_description: An extrasolar planet is a natural planet in a planetary system outside our own solar system.
  In 2013, estimates of the number of terrestrial planets in the Milky Way ranged from at least 17 billion to at least 144 billion. The smaller estimate studied planet candidates gathered by the Kepler space observatory. Among them are 461 Earth-size planets, at least four of which are in the "habitable zone" where liquid water can exist. One of the four, dubbed Kepler-69c, is a mere 1.5 times the size of the Earth and around a star like our own Sun – about as near as the current data allow to finding an "Earth 2.0".
  Earlier work suggested that there are at least 100 billion planets of all types in our galaxy, an average of at least one per star. There are also planets that orbit brown dwarfs, and free-floating planets that orbit the galaxy directly just as the stars do. It is unclear whether either type should be called a "planet".
context_section_description: An extrasolar planet (or exoplanet) is a natural planet in a planetary system outside our own solar system. 
  In 2013, estimates of the number of terrestrial planets in the Milky Way ranged from at least 17 billion to at least 144 billion. The smaller estimate studied planet candidates gathered by the Kepler space observatory. Among them are 461 Earth-size planets, at least four of which are in the "habitable zone" where liquid water can exist. One of the four, dubbed Kepler-69c, is a mere 1.5 times the size of the Earth and around a star like our own Sun – about as near as the current data allow to finding an "Earth 2.0".
  Earlier work suggested that there are at least 100 billion planets of all types in our galaxy, an average of at least one per star. There are also planets that orbit brown dwarfs, and free-floating planets that orbit the galaxy directly just as the stars do. It is unclear whether either type should be called a "planet".
caption: Artist's impression of Fomalhaut B, an exoplanet directly observed by the Hubble telescope
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