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2007-01-31 03:03:31 · 27 answers · asked by HELEN O 1 in Science & Mathematics Astronomy & Space

27 answers

No more, as stated by a recent astronomers agreement (Praga meeting, august 2006) to precisely define the terms of solar system bodies, now that a lot of are known and will be known thank to probes, telescopes, etc. Here down are the specs:

RESOLUTION 5A
The IAU therefore resolves that planets and other bodies in our Solar System, except satellites,be defined into three distinct categories in the following way:

(1) A "planet"1 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.

(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.

(3) All other objects3, except satellites, orbiting the Sun shall be referred to collectively as "Small Solar System Bodies".

1The eight planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
2An IAU process will be established to assign borderline objects into either dwarf planet and other categories.
3These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies.

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

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

and
1The eight classical planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Source(s):

http://www.iau.org/iau0602.423.0.html.....

2007-01-31 03:10:52 · answer #1 · answered by Jano 5 · 0 0

It's not ploto, it's pluto and it "was" and not "is". The international astronomical union has decided that it's not more a planet as it was:-
1) Too small, even smaller than our moon.
2) The satellite of it, charon is too big for it.
and 3) The distance between naptune(in your language) and pluto has a distance difference larger than any other plonet(again in your language).
According to me, it's some kind of a comet or asteroid.

2007-01-31 12:24:32 · answer #2 · answered by Shreyan 4 · 0 0

NO.

To some, Pluto has never been a planet, just part of a larger belt of rock/whatnot on the outer edge of the solar system. One of the reasons being that it's orbit is highly irregular, another reason is that its moon is roughly half its size, very unusual for an actual planet.

A few months ago the International Society of Space Nerds decided to vote that it's officially NOT a planet. So it's officially NOT a planet any more.

Can you imagine how many books and software packages that are wrong now?!

2007-01-31 14:44:19 · answer #3 · answered by fixedinseattle 4 · 0 0

Pluto got demoted from "planet" to "dwarf planet" last year. At the same time Ceres got promoted from "asteroid" to "dwarf planet". That is because the IAU (International Astronomical Union) finally wrote an official definition of "planet". Before 2006 there was no official definition, but the recent discovery that Pluto is actually smaller than the Moon, and the discovery of a number of other objects slightly smaller than Pluto but bigger than any other asteroids pushed the IAU into making an official dividing line between the smallest planet and the biggest asteroid. But so many people complained about it that they compromised and made a new intermediate category called "dwarf planet", to which Pluto now belongs.

2007-01-31 11:09:41 · answer #4 · answered by campbelp2002 7 · 0 0

No Ploto is not a planet. if you are refering to pluto it was recently classified as not a planet but all the text books say it is! its just too small

2007-01-31 11:08:02 · answer #5 · answered by Cap10kirk 3 · 0 0

"Ploto" isn't. Until late 2006, "Pluto" was. Supposedly, scientists now classify it as a star. It was discovered back in the early 60's, I believe. I think someone got bored and wanted something different to do. What difference does it make? That's like quibbling over what color to paint the white stripe in the road. HA!

2007-01-31 11:14:24 · answer #6 · answered by Anonymous · 0 1

Pluto (IPA: /ˈpluːtəʊ/), designated (134340) Pluto in the Minor Planet Center catalogue, is the second-largest known dwarf planet in the solar system and the tenth largest body orbiting the Sun. It orbits between 29 and 49 AU from the Sun, and was the first Kuiper Belt object to be discovered. Approximately one-fifth the mass of the Earth's Moon, Pluto is primarily composed of rock and ice. It has an eccentric orbit that is highly inclined with respect to the planets and takes it closer to the Sun than Neptune during a portion of its orbit. Pluto and its largest satellite, Charon, could be considered a binary system because they are closer in size than any of the other known celestial pair combinations in the solar system, and because the barycentre of their orbits does not lie within either body. However, the International Astronomical Union (IAU) has yet to formalize a definition for binary dwarf planets, so Charon is currently regarded as a moon of Pluto. Two smaller moons, Nix and Hydra, were discovered in 2005. Pluto is smaller than several of the natural satellites or moons in our solar system (see the list of solar system objects by radius).

From its discovery by Clyde Tombaugh in 1930, Pluto was considered the Solar System's ninth planet. In the late 20th and early 21st century, many similar objects were discovered in the outer solar system, most notably the trans-Neptunian object Eris which is slightly larger than Pluto. On August 24, 2006 the IAU defined the term "planet" for the first time. This definition excluded Pluto, which was then reclassified under the new category of dwarf planet along with Eris and Ceres.[1] Pluto is also classified as the prototype of a family of trans-Neptunian objects.[2][3] After the reclassification, Pluto was added to the list of minor planets and given the number 134340.[4][5]

2007-01-31 11:07:24 · answer #7 · answered by Anonymous · 1 1

Pluto is not anymore. It is now considered a minor planet, such as Ceres. I've never heard of Ploto, though...

2007-01-31 11:07:14 · answer #8 · answered by Anonymous · 0 0

If there is a ploto & it is nearby - then they must have been hushing it up elaborately for a long long time, coz I have never heard of a ploto

2007-01-31 14:24:25 · answer #9 · answered by Wise Kai 3 · 0 0

i dont know about ploto but pluto is a dwarf planet

2007-02-01 15:50:57 · answer #10 · answered by Dominic 1 · 0 0

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