KIDS TRIVIA

Detailed explanation-1: -Pluto is a complex world of ice mountains and frozen plains. Once considered the ninth planet, Pluto is the best known of a new class of worlds called dwarf planets.

Detailed explanation-2: -In 2006 the International Astronomical Union (IAU) demoted the much-loved Pluto from its position as the ninth planet from the Sun to one of five “dwarf planets.” The IAU had likely not anticipated the widespread outrage that followed the change in the solar system’s lineup.

Detailed explanation-3: -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-4: -Pluto last crossed inside Neptune’s orbit on February 7, 1979, and temporarily became the 8th planet from the Sun. Pluto will cross back over Neptune’s orbit again on February 11, 1999 to resume its place as the 9th planet from the Sun for the next 228 years.

Detailed explanation-5: -Planet Nine is a hypothetical giant planet that might be orbiting the Sun somewhere beyond Pluto. Its presence is one possible explanation for the weird way a handful of small icy objects in the outskirts of the solar system seem to cluster into very similar orbits.