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
Why Is Pluto Not a Planet? SciShow Space Edit It looks like we don't have any trivia for this title yet. Be the first to contribute.Learn more Contribute to this page Suggest an edit or add missing content IMDb Answers: Help fill gaps in our data Learn more about contributing Edit pag...
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 ...
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. ...
Pluto is not a comet; its orbit does not take it into the inner solar system, as the orbits of comets do. As for the requirement that an object “clear its orbit” to be considered a planet, this determination is highly subjective. Applied literally, it would exclude all the planets in...
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...
Leonard David
For a long time, Pluto was considered to be the 9th and tiniest planet in our solar system. However, after scientists made some new discoveries, they decided it really wasn't a planet after all. Come learn about Pluto and why it is no longer called a planet. ...