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Kepler-22b
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Kepler-22b : ウィキペディア英語版
Kepler-22b


Kepler-22b is an extrasolar planet orbiting G-type star Kepler-22.〔 It is located about 600 light years from Earth in the constellation of Cygnus. It was discovered by NASA's Kepler Space Telescope in 2011 and was the first known transiting planet to orbit within the habitable zone of a Sun-like star.〔(【引用サイトリンク】title=NASA – NASA's Kepler Confirms Its First Planet in Habitable Zone of Sun-like Star )〕〔〔(Kepler-22b: Facts About Exoplanet in Habitable Zone )〕
==Discovery and observation==
The planet's first transit in front of its host star was observed on Kepler's third day of scientific operations, in 12 May 2009. The third transit was detected on 15 December 2010. Additional confirmation data was provided by the Spitzer Space Telescope and ground-based observations. On 5 December 2011, the confirmation of the existence of Kepler-22b was announced.〔

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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