Pluto planetary status debate reignited 20 years after reclassification

Twenty years after the International Astronomical Union (IAU) reclassified Pluto as a dwarf planet, the decision remains a subject of scientific and public debate. The 2006 reclassification occurred following the discovery of other large celestial bodies in the Kuiper Belt, such as Eris, which prompted the IAU to establish specific criteria for what constitutes a planet.

To be classified as a planet, a celestial body must orbit the Sun, possess sufficient mass to assume a nearly round shape, and have cleared its orbital neighborhood of other objects. Pluto failed the third criterion, as its orbit is shared with numerous Kuiper Belt objects.

Recently, NASA Administrator Jared Isaacman has reignited the discussion by advocating for Pluto to be reinstated as a planet, citing national pride since Pluto was discovered by American astronomer Clyde Tombaugh in 1930. While some scientists argue the current definition is necessary to prevent the solar system's planet count from growing indefinitely, others suggest that evolving scientific understanding may require a re-evaluation of these planetary classifications.