The state or condition of being a planet. In 2006, the International Astronomical Union , which has the final say on matters of astronomical nomenclature, voted on a formal definition of what makes a planet. planethood (uncountable) The state or condition of being a planet… What is the Kuiper belt? What is the meaning of planethood? Following the discovery of Eris in 2005, the IAU attempted to clear up the confusion surrounding planethood by voting on a new definition for planets at its General Assembly in 2006. What are synonyms for planethood? flattie What is the meaning of planethood? Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. Pluto at 85 – Pluto and Planethood. What is the definition of planethood? Origin. How is Pluto different from the other planets? SCIENCE Before reading: Name all the planets in our solar system. What are synonyms for planethood? A proposed revision to the criteria would instead grant planethood to the moon What makes something a planet? Word of the day. From its discovery in 1930 until 2006, Pluto was classified as Planet. Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. Origin. Noun . Constructed as planet + -hood. Planethood means the state or condition of being a Planet. The state or condition of being a planet. How do you use planethood in a sentence? From planet + -hood. [ILLUSTRATION OMITTED] Within a week, more than 300 scientists had signed a petition rejecting the new definition. ... Reasons Pluto should not be a planet. The recognition that Eris is slightly larger than Pluto is partly what prompted the search for a new definition of planethood. Word of the day. The discovery of other solar-system “wanderers” rivaling Pluto in size suddenly had scientists asking what wasn’t a planet. But the scientific definition was fairly loose until recently. At the end of the General Assembly, a majority of the remaining 500 members still present for the vote passed the IAU planet definition resolution. What are two different ways […] Because of its low mass and slow orbital speed around the sun, it has not been able to clear its path of asteroids and comets. What is the definition of planethood? Last August, after 75 years of planethood, Pluto lost its status when the International Astronomical Union (IAU) came up with a new definition of what it means to be a planet. Simply looking at the IAU definition, it is the last point that is a problem for Pluto. During reading: What five planets have scientists known since ancient times? According to their decision a planet must satisfy the following three criteria: How do you use planethood in a sentence? 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