Pluto was excluded from the museum exhibit because it did not meet the criteria of clearing its orbit of other bodies as defined by the IAU in 2006.
The reason for excluding Pluto from the museum exhibit was that it did not meet the newly formalized definition of a planet set by the International Astronomical Union (IAU) in 2006. According to this definition, a celestial body can only be considered a planet if it has cleared its orbit of other bodies, which Pluto has not done as it is situated within the Kuiper belt.
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