What is the Kuiper belt? SCIENCE Before reading: Name all the planets in our solar system. [ILLUSTRATION OMITTED] Within a week, more than 300 scientists had signed a petition rejecting the new definition. Michael Brown is a planetary scientist at the California Institute of Technology and the co-discoverer of Eris, a dwarf planet in the outer solar system. Word of the day. Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. What are synonyms for planethood? Origin. What are two different ways […] The discovery of other solar-system “wanderers” rivaling Pluto in size suddenly had scientists asking what wasn’t a planet. A proposed revision to the criteria would instead grant planethood to the moon Noun . The state or condition of being a planet. The recognition that Eris is slightly larger than Pluto is partly what prompted the search for a new definition of planethood. 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. Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. (The official press release is here.) How is Pluto different from the other planets? Clyde.W. Tombough discovered Pluto on march13, 1930. 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. How do you use planethood in a sentence? 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. According to their decision a planet must satisfy the following three criteria: What are synonyms for planethood? flattie Constructed as planet + -hood. During reading: What five planets have scientists known since ancient times? How do you use planethood in a sentence? ... Reasons Pluto should not be a planet. But the scientific definition was fairly loose until recently. planethood (uncountable) The state or condition of being a planet… Origin. What is the meaning of planethood? Planethood means the state or condition of being a Planet. When astronomers last redefined "planet", Pluto was demoted to being a dwarf. Pluto at 85 – Pluto and Planethood. Late 17th century; earliest use found in Nathaniel Fairfax (1637–1690), physician and antiquary. From its discovery in 1930 until 2006, Pluto was classified as Planet. What makes something 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. From planet + -hood. Word of the day. To a dynamicist, what qualities make an object a planet? 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