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Kepler-11
Kepler-11 is a Sun-like star slightly larger than the Sun in the constellation Cygnus, located some 2,000 light years from Earth.〔(Astronomers Find 6-Pack of Planets in Alien Solar System )〕 It is located within the field of vision of the Kepler spacecraft, the satellite that NASA's Kepler Mission uses to detect planets that may be transiting their stars. Announced on February 2, 2011, the star system is among the most compact and flattest systems yet discovered. It is the first discovered case of a star system with six transiting planets. All discovered planets are larger than Earth, with the larger ones being about Neptune's size.
==Nomenclature and history==
Kepler-11 and its planets were discovered by NASA's Kepler Mission, a mission tasked with discovering planets in transit around their stars. The transit method that Kepler uses involves detecting dips in brightness in stars. These dips in brightness can be interpreted as planets whose orbits move in front of their stars from the perspective of Earth. Kepler-11 is the first discovered exoplanetary system with more than three transiting planets.
Kepler-11 is named for the Kepler Mission: it is the 11th star with confirmed planets discovered in the Kepler field of view.
The planets are named alphabetically, starting with the innermost: ''b'', ''c'', ''d'', ''e'', ''f'', and ''g'', distinguishers that are tagged onto the name of their home star.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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