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...
“Planetary confusion: why astronomers keep changing what it means to be a planet”on The Conversation website Plutoon the NASA Solar System Exploration website Join our newsletter Your inbox will be safe. No spam, just thought-provoking content. We respect your privacy. Unsubscribe at any time...
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...
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.EBSCO_AspAstronomy
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’...
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...
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When Pluto was "demoted" from a planet to a dwarf planet back in 2006, it was a sore subject for many. Then, in 2015, a spaceship gave us our first-ever close-up of Pluto. Read why Pluto is no longer a planet, how it got its name and more cool facts.
9. Why Pluto is not a Planet 10. The search for life in the galaxy Part II . Galaxies 11. The interstellar medium 12. Our milky way 13. The Universe of galaxies 14. The expansion of the Universe 15. The early Universe 16. Quasars and Supermassive black holes Part III ...