Double planet
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High Quality Content by WIKIPEDIA articles! "Double planet" is an informal term used to describe a planet with a moon that may be large enough to be considered a planet in its own right; one definition requires that the objects orbit a centre of gravity that is above their surfaces. The formal term is "binary system". Similarly, there are also double asteroid systems such as 90 Antiope, and double Kuiper belt object systems such as 1997 CS29 and 1998 WW31. As of 2009, there are no official double planets. The European Space Agency has referred to the Earth-Moon system as a type of double…mehr

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High Quality Content by WIKIPEDIA articles! "Double planet" is an informal term used to describe a planet with a moon that may be large enough to be considered a planet in its own right; one definition requires that the objects orbit a centre of gravity that is above their surfaces. The formal term is "binary system". Similarly, there are also double asteroid systems such as 90 Antiope, and double Kuiper belt object systems such as 1997 CS29 and 1998 WW31. As of 2009, there are no official double planets. The European Space Agency has referred to the Earth-Moon system as a type of double planet. The IAU General Assembly in August 2006 had a draft proposal that considered the Pluto-Charon system as a type of double planet.