The Nine Planets (Historical Perspective):
In the past, the solar system was commonly taught with nine planets, including Pluto. These nine planets were, in order of their distance from the Sun: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto The concept of nine planets was widely accepted until 2006 when the IAU introduced new criteria for classifying celestial objects as planets. According to these criteria, Pluto did not meet all the requirements to be considered a full-fledged planet, leading to its reclassification as a "dwarf planet." Pluto's reclassification generated much discussion and debate among astronomers, educators, and the general public. While it is no longer considered one of the major planets in the solar system, Pluto remains a fascinating celestial object and is of continued interest to astronomers and space enthusiasts. If you're looking for more detailed or up-to-date information on this topic or have specific questions, please let me know, and I