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Origin: sally.csie.ntu.edu.tw

稍微整理了一下

草案：

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5A

The IAU therefore resolves that planets and other bodies in our Solar System
be defined into three distinct categories in the following way:

(1) A planet is a celestial body that (a) is in orbit around the Sun, (b)
has sufficient mass for its self-gravity to overcome rigid body forces so
that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has
cleared the neighbourhood around its orbit.

行星：
(a)要繞著太陽旋轉
(b)要有足夠的質量使自身的重力可和剛體的力維持流體靜力平衡（也就是要接近圓形）
(c)有能力能清除其軌道附近其他物體的天體

(2) A dwarf planet is a celestial body that (a) is in orbit around the Sun,
(b) has sufficient mass for its self-gravity to overcome rigid body forces so
that it assumes a hydrostatic equilibrium (nearly round) shape2, (c) has not
cleared the neighbourhood around its orbit, and (d) is not a satellite.

矮行星：
(a)要繞著太陽旋轉
(b)要有足夠的質量使自身的重力可和剛體的力維持流體靜力平衡（也就是要接近圓形）
(c)沒有能力能清除其軌道附近其他物體的天體
(d)不是個衛星

(3) All other objects orbiting the Sun shall be referred to collectively as
"Small Solar System Bodies".

其他繞太陽旋轉的則稱為Small Solar System Bodies（太陽系小天體吧）


5B

Insert the word "classical" before the word "planet" in Resolution 5A,
Section (1), and footnote . Thus reading:

(1) A classical planet is a celestial body . . .

在第一草案的行星前加入classical一字（應該是翻做經典）

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決議：

==============================================================================


The IAU members gathered at the 2006 General Assembly agreed that a "planet"
is defined as a celestial body that (a) is in orbit around the Sun, (b) has
sufficient mass for its self-gravity to overcome rigid body forces so that it
assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared
the neighbourhood around its orbit.

This means that the Solar System consists of eight "planets" Mercury, Venus,
Earth, Mars, Jupiter, Saturn, Uranus and Neptune. A new distinct class of
objects called "dwarf planets" was also decided. It was agreed that "planets"
and "dwarf planets" are two distinct classes of objects. The first members of
the "dwarf planet" category are Ceres, Pluto and 2003 UB313 (temporary name).
More "dwarf planets" are expected to be announced by the IAU in the coming
months and years. Currently a dozen candidate "dwarf planets" are listed on
IAU's "dwarf planet" watchlist, which keeps changing as new objects are found
and the physics of the existing candidates becomes better known.

The "dwarf planet" Pluto is recognised as an important proto-type of a new
class of trans-Neptunian objects. The IAU will set up a process to name these
objects.

=============================================================================

5A通過，但是5B則沒有通過

於是太陽系只剩下八大行星：

水星、金星、地球、火星、木星、土星、天王星、海王星

而依照此定義的第一批矮行星則有了三個：

穀神星、冥王星、2003 UB313（也就是Xena）

而IAU將會繼續定出更多的矮行星出來，並且設定一個命名程序

八大行星應該不會再變了

矮行星應該會愈變愈多

--
Deserves death! I daresay he does. Many that live deserve death. And some die
that deserve life. Can you give that to them? Then be not too eager to deal out
death in the name of justice, fearing for your own safty. Even the wise cannot
see all ends.

                                                               Gandalf to Frodo

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