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A fusor, according to a proposal to the IAU by Gibor Basri, Professor of Astronomy at the University of California, Berkeley to help clarify the nomenclature of celestial bodies, is "''an object that achieves core fusion during its lifetime.''" This definition included any form of nuclear fusion so the lowest possible mass of a fusor was set at roughly 13 times that of Jupiter, at which point deuterium fusion becomes possible. This is significantly smaller than the point at which sustained fusion of hydrogen becomes possible, around 60 times the mass of Jupiter. Objects are considered "stellar" when they are about 75 times the mass of Jupiter, when gravitational contraction, i.e. contraction of the object due to gravity, is halted by heat generated by the nuclear reaction in their interiors.〔 Fusars would include active stars, dead stars, and brown dwarfs. The introduction of the term "fusor" would allow for a simple definition: * Planet – A planemo that orbits a fusor * Planemo – A round nonfusor * Fusor – An object capable of core fusion where ''round'' is understood as "whose surface is very nearly on the gravitational equipotential", ''orbits'' means "whose primary orbit is now, or was in the past around", and ''capable'' implies fusion is possible sometime during the existence of the object by itself. == See also == * Dwarf planet * Exoplanet * Gas giant * Mesoplanet * Planetar (astronomy) * Planetesimal * Planetoid * Pulsar planet 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fusor (astronomy)」の詳細全文を読む スポンサード リンク
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