There’s been a fierce debate over the past two decades about the status of the distant icy world of Pluto after it was contentiously stripped of its planethood and reclassified as a dwarf planet.Nasa chief Jared Isaacman has indicated that he might revisit the matter but it won’t be an easy decision because scientists are still “worlds apart” on the issue, said The Observer.Rock and icePluto was discovered on 18 February 1930 by an American astr…