Is Pluto a Planet?Though small and very far from the Earth, we've always thought of Pluto(冥王星) as the ninth planet in our solar system; however, there has beendebate among astronomers about Pluto's validity as a planet.Most people do in fact consider it a planet thinking t bizarre ...
Is Pluto Really a Planet? the Debate Continues
Why can’t astronomers decide on whether or not Pluto is a planet? Everyday Einstein explains the controversy about our faraway neighbor
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On August 24, 2006, at the 26th General Assembly of the International Astronomical Union (IAU) in Prague, by a majority vote of only the 424 members present, the IAU (an organization of over 10,000 members) passed a resolution defining planet in such a way as to exclude Pluto and establ...
On August 24, 2006, at the 26th General Assembly of the International Astronomical Union (IAU) in Prague, by a majority vote of only the 424 members present, the IAU (an organization of over 10,000 members) passed a resolution defining planet in such a way as to exclude Pluto and ...
But why isn't Pluto considered a planet anymore? It starts with the definition of a planet — or lack thereof. Before 2006, there weren't strict criteria for a planet. Instead, planets were loosely regarded as objects larger than asteroids that orbited the sun. In the mid-1800s, for ex...
数十年来，科学家普遍认为太阳系有九大行星，但随着一颗比冥王星更大、更远的天体的发现，使得冥王星大行星地位的争论愈演愈烈。一是由于其发现的过程是基于一个错误的理论；二是由于当初将其质量估算错了，误将其纳入到了大行星的行列。因此在国际天文学联合会大会上，是否要给冥王星“正名”成为了...
The International Astronomical Union (IAU) downgraded the status of Pluto tothat of a dwarf planet because it did not meet the three criteria the IAU uses to define afull-sized planet Essentially Pluto meets all the criteria except one-t "has not clearedit neighboring region of other objects....
作者:Weintraub, David A. 出品人: 页数:272 译者: 出版时间:2008-11 价格:$ 25.93 装帧: isbn号码:9780691138466 丛书系列: 图书标签: Is Pluto a Planet? 2024 pdf epub mobi 电子书 图书描述 This is a note from the author. On August 24, 2006, at the 26th General Assembly of the International...