Thó-lūn:Mê-ông-chheⁿ
Guā-māu
冥王星
[kái goân-sí-bé]冥王星 (Pluto)是太陽系較外口爿的一粒星體(celestial body),1930年予人發現,當做一粒惑星,伊的軌道佮別粒惑星無仝,加真趨,有時仔閣並海王星較倚日頭,1978年揣著伊上大粒的衛星凱倫(Charon),2005年閣揣著另外二粒較細粒的衛星Nix佮Hydra,國際天王組合 (IAU)佇2006年8月通過共冥王星的地位對惑星降級到矮惑星 (dwarf planet). [1]
佮別粒惑星相比並,冥王星加真細粒,軌道嘛真無相(相同),欲按怎共定位在來攏有爭議,愈來愈濟人同意伊是主要的惑星,又閣是次要的惑星,冥王星嘛算是海王星外星體(trans-Neptunian object),因為2005年7月31揣著一粒海王星外星體2003 UB313,並冥王星閣較大粒。
外部連結
[kái goân-sí-bé]- NASA's Pluto fact sheet
- StudyWorks! Online: Is Pluto a Planet? - summarizes the pros and the cons of classifying Pluto as a planet
- David H. Freedman, "When is a Planet Not a Planet?", Atlantic Monthly, February 1998.
- NASA's Pluto-Kuiper Belt Mission - launching in early 2006.
- Pluto in Science Fiction - Bibliography of science fiction which is set on Pluto.
- Pluto/Neptune crossings
- Space.com article on second and third moons
- NASA's Hubble Reveals Possible New Moons Around Pluto – Hubble Press Release
- Possible New Moons