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*says* My Very Educated Mother, Just Served Us Nine.... we need a new rhyme.
About 2,500 experts were in Prague for the International Astronomical Union's (IAU) general assembly.
The scientists rejected a proposal that would have retained Pluto as a planet and brought three other objects into the cosmic club.
Pluto has been considered a planet since its discovery in 1930 by the American Clyde Tombaugh.
The ninth planet will now effectively be airbrushed out of school and university textbooks.
"The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune," said the IAU resolution, which was passed following a week of stormy debate.
The scientists rejected a proposal that would have retained Pluto as a planet and brought three other objects into the cosmic club.
Pluto has been considered a planet since its discovery in 1930 by the American Clyde Tombaugh.
The ninth planet will now effectively be airbrushed out of school and university textbooks.
"The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune," said the IAU resolution, which was passed following a week of stormy debate.
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