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IAU 2006 General Assembly: video-records of the discussion and of the final vote on the Planet definition. Planet Definition Questions & Answers Sheet, International Astronomical Union Official Site; Q&A: The IAU's Proposed Planet Definition Q&A article on the new definition from SPACE.com; Dwarf planet discoverer Mike Brown explains the ...
Pluto fulfills the first two of these criteria, but not the third and therefore does not qualify as a planet under this formalized definition. The IAU's decision has not resolved all controversies. While many astronomers have accepted it, some planetary scientists have rejected it outright, proposing a geophysical or similar definition instead.
"Clearing the neighbourhood" is one of three necessary criteria for a celestial body to be considered a planet in the Solar System, according to the definition adopted in 2006 by the International Astronomical Union (IAU). [1] In 2015, a proposal was made to extend the definition to exoplanets. [2]
Here's what to know about the brief tenure of our solar system's smallest planet. ... for Planet Definition 24 August 2006 in Prague. ... satisfy one of three newly defined criteria to be a planet.
The 2006 IAU definition presents some challenges for exoplanets because the language is specific to the Solar System and the criteria of roundness and orbital zone clearance are not presently observable for exoplanets. [1] In 2018, this definition was reassessed and updated as knowledge of exoplanets increased. [216]
The geophysical definition of a planet put forth by Stern and Levinson is an alternative to the IAU's definition of what is and is not a planet and is meant to stand as the geophysical definition, while the IAU definition, they argue, is intended more for astronomers. Nonetheless, some geologists favor the IAU's definition.
In 2006, Tancredi was one of a number of dissenters at the IAU's meeting to establish the first definition of "planet. " As an alternative to the IAU's draft proposal, which had included Pluto, its moon Charon and Ceres among the planets, Tancredi with his Uruguayan colleague Julio Ángel Fernández proposed a definition where they reserved the term "planet" only for those objects in the Solar ...
The assessments of the IAU, Tancredi et al., Brown, and Grundy et al. for some of potential dwarf planets are as follows. For the IAU, the acceptance criteria were for naming purposes; Quaoar was called a dwarf planet in a 2022–2023 IAU annual report. [24]