Скачать или смотреть 2006 definition of planet | Wikipedia audio article

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/IAU_def...


00:02:02 1 Background
00:07:14 2 Proposals
00:07:23 2.1 First draft proposal
00:12:36 2.1.1 Advantages
00:14:08 2.1.2 Criticism
00:16:37 2.2 Alternative proposal
00:17:27 2.3 Revised draft proposal
00:20:43 2.4 Final draft proposal
00:20:58 2.4.1 Plenary session debate
00:24:32 3 Final definition
00:25:09 4 Closing issues
00:25:19 4.1 Substance
00:28:09 4.2 Process
00:29:24 5 Impact
00:30:15 5.1 Popular culture
00:31:56 5.2 Plutoed
00:33:05 6 See also



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Socrates


SUMMARY
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The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, a planet is a celestial body which:

is in orbit around the Sun,
has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
has "cleared the neighborhood" around its orbit.Among other things, this definition caused Pluto to no longer be a planet, a change from how it had been widely considered until that point.
A non-satellite body fulfilling only the first two of these criteria (such as Pluto) is classified as a "dwarf planet". According to the IAU, "planets and dwarf planets are two distinct classes of objects". A non-satellite body fulfilling only the first criterion is termed a "small Solar System body" (SSSB). An alternate proposal included dwarf planets as a subcategory of planets, but IAU members voted against this proposal. The definition was a controversial one, and has drawn both support and criticism from different astronomers, but has remained in use.
According to this definition, there are eight known planets in the Solar System. The definition distinguishes planets from smaller bodies and is not applicable outside the Solar System. To date, there is no accepted definition of extrasolar planets, or exoplanets. In 2007, an IAU working group issued a position statement that proposes to distinguish exoplanets from brown dwarfs on the basis of mass, but there has been no IAU-wide resolution or vote associated with this position statement. A separate proposal to extend the IAU definition to exoplanets has not been formally reviewed by the IAU.