THEN: Pluto is a planet
过去认为:冥王星是一颗行星。
NOW: Pluto isn't a planet
现在认为:冥王星不是行星。
We've known since the late 1800s that a ninth planet, after Uranus, potentially existed. In 1906, Percival Lowell, the founder of the Lowell Observatory in Flagstaff, Arizona, even began a research project intended to locate the mysterious "Planet X."
自从19世纪末以来,人类就知道,自天王星之后可能存在第九颗行星。1906年,美国亚利桑那州弗拉格斯塔夫的罗威尔天文台的创立者帕西瓦尔•罗威尔甚至发起了一个研究项目,试图定位这个神秘的X行星。
Then in 1930, a 23-year-old newbie at the facility found it. The discoverer, Clyde Tombaugh, had been tasked with systematically comparing photographs of the sky taken weeks apart to search for any moving objects. He eventually saw one and submitted his finding to the Harvard College Observatory. After an 11-year-old English girl named the new planet (for the Roman god of the underworld), we started including Pluto as a planet in our solar system.
1930年,该天文台一名23岁的新人发现了这颗行星的位置。发现者克莱德•汤博接到的任务是,通过比照拍摄时间相隔数周的星空照片来搜寻任何移动的天体。最终汤博发现了一个新天体,并将这一发现呈交给哈佛大学天文台。一个11岁的英国小女孩用罗马神话中的冥神为这颗新行星命名后,人类就开始将冥王星纳入我们的太阳系。
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