why did the pluto was lost in the solar system?

Answer 1

http://en.wikipedia.org/wiki/pluto

this does not change anything about pluto or the solar system. this just corrects the mistake of classifying pluto as a planet initially. pluto does orbit the sun, is ball-shaped and is not a satellite, but it does not have an isolated orbit (a bunch of other similar bodies have similar orbits.) so it is not a planet, and it never was. this was the right thing to do, believe me.

some astronomers believed that a giant planet orbited the sun beyond neptune. one astronomer discovered pluto during the search for this hypothetical planet because pluto just happened to be where he was searching. astronomers soon realized that pluto was not massive enuff to be what they were looking for. they also realized that pluto's orbit was unlike any planet's.

i have been waiting for this since i was about ten when i learned that pluto didn't fit the pattern set by the major bodies in the solar system so it was an anomaly. it just felt "out of place". now that astronomers have found hundreds of other bodies with similar orbits, classifying "134340 pluto" as a planet is even more irrational. one of these, "136199 eris", is about five percent bigger than "134340 pluto".

i feel somewhat satisfied, but i don't know how long this will drag on tho. many planetary astronomers are not satisfied that the definition is rigorous enuff. i can accept that the definition is flawed, but i can not accept that "134340 pluto" is a planet.

this same thing happened has happened before. in 1800, an astronomer found a body orbiting the sun between the orbits of mars and jupiter and thought it was a planet. astronomers finally stopped classifying them as planets in about 1850 after they found several other bodies with similar orbits, and no one thinks ceres, pallas, juno, and vesta are planets today.

incidentally, "134340 pluto" was never a moon of neptune. neptune did capture triton. this is why triton has a retrograde orbit. many astronomers consider pluto and charon to be a binary system, but two small bodies orbit that system. they are called nix and hydra.

Answer 2

The International Astronomical Union decided that Pluto was no longer a planet. The reason is that while Pluto is round, orbits the sun, and has three moons, it has not cleared (via gravity) the neighborhood of its own orbit of debris. Instead, they decided to classify it as a "dwarf planet".

There is a precedent for this. When Ceres was first discovered in 1801, it was considered to be a planet. After astronomers discovered several other objects in the same orbit, it was reclassified as an asteroid. And, in 2006, it was again reclassified as "dwarf planet" just like Pluto.

Neither Ceres nor Pluto have enough mass (gravity) to accrete all the junk from their orbits. They will be "dwarf planets" until we humans decide otherwise.

See the details below.

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" [footnote 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) shape [footnote 2] , (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.

(3) All other objects [footnote 3] except satellites orbiting the Sun shall be referred to collectively as "Small Solar-System Bodies".


Footnote 1: The eight "planets" are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Footnote 2: An IAU process will be established to assign borderline objects into either dwarf planet and other categories.

Footnote 3: These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies.

RESOLUTION 6A
The IAU further resolves:

Pluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.

Answer 3

It was decided that Pluto had a lot more in common with the millions of objects in the Kuiper belt of the outer solar system than it did with the real planets of the inner and middle solar system. Those objects are basically comets, big balls of rocky ice. Pluto's size, composition, orbital inclination (tilted from the ecliptic plane of the rest of the planets), orbit shape (strongly elliptical) and location (farthest out) all pointed to it.

Answer 4

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.

Answer 5

Pluto is still part of our solar system. The loss of status in the rank of the planets was a correction. Pluto never deserved a place among the "classical" planets.
If your native language (as in my case) is not English I would recommend you one of two ways.:
Look for a Yahoo-Answers area of you language
or get more familiar with the structure of the English language.

Answer 6

What are you saying. If your asking why isn't Pluto a planet in our solar system anymore the answer is because it don't follow the curriculum of what a planet is supposed to be. If you want to know what are the guidelines of a planet to be in out solar system check on google

Answer 7

Because the grammar was lost.

Answer 8

i read because it is a drwaf planet.not a planet

Answer 9

It wasn't 'lost', it was demoted. Big difference! ~

Answer 10

Lost in space ... danger! danger!