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”成为了大...
The author discusses the International Astronomical Union's (IAU) categorization system for planets, arguing against its consideration of location and for the reinstatement of Pluto as a planet.EicherDavidJ.Astronomy
A different proposal kept the total at 9, defining the planets as just the familiar ones we know without any scientific rationale, and a third would drop the number of planets down to 8, and Pluto would be out of the planet club. But, then… what is Pluto?In the end, astronomers vote...
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On this basis alone, people like Stern have said, Pluto should be considered a planet since it is a dynamic place, a place that is not so static that only micrometeorites disturb its surface. Views of Charon, Pluto's moon, also show a very dynamic place, including a red cap on its ...
【题目】Why Is Pluto No Longer a Planet?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 ...
Why isn’t Pluto a planet anymore? And what is a planet anyway? Astrophysicist Jackie Faherty explains! If you’re more of a dinosaur person, check... 其它视频 9:58 How We Could Build a Moon Base TODAY – Space Colonization 1 33 人观看 16:54 How the C-Section Became America’...
Beyond Pluto lies a new solar system frontier. Pluto is just the start. Pluto is the end of the first chapter, and the beginning of the second. John Wenz Writer John Wenz is a Popular Mechanics writer and space obsessive based in Philadelphia. He tweets @johnwenz. ...
This has got to be be one of the most heartbreaking questions I get asked, "Why Isn't Pluto a Planet". And I get it a lot. I was expecting that a few years after the International Astronomical Union's controversial decision, the debate would have settled down and people would finally...