"The IAU's definition of 'planet' requires an object to orbit the Sun, achieve hydrostatic equilibrium, and clear its orbit, which excludes many fascinating celestial bodies."
"Many planetary scientists use the term 'planet' to refer to a broader range of objects, including dwarf planets and moons, despite the IAU's restrictive criteria."
"Ceres was originally classified as the eighth planet of the solar system, highlighting the historical context and evolving understanding of what constitutes a planet."
In 2006, the International Astronomical Union defined 'planet' with three criteria: it must orbit the Sun, achieve hydrostatic equilibrium, and clear its orbit. This definition distinguishes eight major planets from other celestial bodies. However, many interesting objects, such as dwarf planets and moons, do not meet these criteria yet are often referred to as planets by scientists. The case for reclassifying Pluto and similar bodies as planets is presented, emphasizing the need for a broader definition of planetary status.
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