名相: 行星

彩虹七色, 八大行星,

冥王星的運動不是開會所能決定, 開會能決定的不過名相. 於是教科書又有一輪修訂工夫要做. 唉.

IAU: giving "planet" a polish:

That was despite one man’s suggestion that “nearly round” and “has cleared the neighbourhood around its orbit” required so much interpretation that the resolution had no meaning. “There is so much common sense in the resolution that I would propose to drop all the resolutions and keep footnote 1,” he said.

Oh yes, they laughed. Footnote 1 of resolution 5A, to remind you, stated that “The eight classical planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.”

Nature News: Pluto loses planet status:

But despite the successful vote and the IAU's best efforts at clarity, it seems there is still scope for some confusion. Already at the conference there are hints of problems. "Dwarf stars are stars. Dwarves are people," reasons Donald Lubowich, coordinator of astronomy outreach for Hofstra College of Liberal Arts and Sciences in Hempstead, New York. So as far as he is concerned, Pluto — the 'dwarf' planet — is still a planet.