行星定义
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Planet Definition Committee 行星定义委员会
definition of planet 行星的定义 ; 行星定义
planet definition
行星的定义
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Well, now another group of astronomers, many of whom are in favor of keeping Pluto a planet, is challenging that new definition, saying it doesn't set clear criteria for what makes a planet.
NPR: Astronomers Prepare to Fight Pluto Demotion
Years ago I heard a definition for a planet that had to do with its atmosphere.
Astronomers will vote next week on whether to change the definition of a planet.
NPR: A Down-to-Earth View of the Planet Debate
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