SOLAR SYSTEM

Detailed explanation-1: -Answer. The International Astronomical Union (IAU ) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one-it “has not cleared its neighboring region of other objects.”

Detailed explanation-2: -It won’t happen though. Space is too big and object’s orbits are too far from each other. Planet formation happened within the proto-planetary disk at distances much closer to the Sun.

Detailed explanation-3: -Scientists have explained how it happened that Pluto’s orbit is both unstable and stable. The reason for this is a special resonance with Neptune, which is called vZLK oscillation. Other gas giants are also contributing to the stabilization of its orbit. Pluto has an elongated orbit with an eccentricity of 0.25.

Detailed explanation-4: -On August 24, 2006 at the International Astronomy Union (IAU) General Assembly the ninth planet was scrubbed only 76 years after its discovery. Even weirder is that it actually got voted out, and by astronomers, not planetary scientists.

Detailed explanation-5: -It’s smaller than any other planet–even smaller than Earth’s moon. It’s dense and rocky, like the terrestrial planets (Mercury, Venus, Earth and Mars). Pluto’s orbit is erratic. One of its moons, Charon, is about half Pluto’s size. 25-Aug-2006