Pluto was reclassified from a planet to a "dwarf planet" in 2006 by the International Astronomical Union (IAU). This decision was based on a new definition of what constitutes a planet. According to the IAU, a celestial body must meet three criteria to be considered a planet: 1. It must orbit the Sun. 2. It must be spherical in shape, due to its own gravity. 3. It must have "cleared the neighborhood" around its orbit, meaning it is gravitationally dominant and has removed most other objects in i

Why is Pluto not a planet? Pluto, the former ninth planet in our solar system, was reclassified as a "dwarf planet" in 2006 by the International Astronomical Union (IAU). This decision was based on new scientific findings that revealed Pluto did not meet the criteria for a planet. One of the key factors in this decision was Pluto's size. While it was once believed to be a sizable planet, scientists have since discovered that it is much smaller than originally thought. In fact, it is smaller than