Describes Pluto compared to the planets previously known; explains how similar objects in space beyond Pluto made scientists decide to reclassify it as a dwarf planet; and discusses its moons and space probes sent to explore it.
Describes Pluto compared to the planets previously known; explains how similar objects in space beyond Pluto made scientists decide to reclassify it as a dwarf planet; and discusses its moons and space probes sent to explore it.