Planet Definition Debate History

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possible 10th planet

Science Mission Directorate | Science

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What is a Planet? - NASA Science

Summary

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69% Informative

The number of "planets" in our solar system has fluctuated, sometimes numbering as high as 15 , before it was determined that some were actually asteroids.

Eris was discovered and hailed as a possible 10th planet in 2005 .

The astronomical community is currently undergoing a discussion debating the issue of how to classify, or define, a planet.

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informal

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English

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