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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]
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 the immediate aftermath of the IAU definition of dwarf planet, ... it is a borderline body by many criteria, and is therefore italicized. Charon, a moon of Pluto ...
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 IAU is also responsible for the system of astronomical telegrams which are produced and distributed on its behalf by the Central Bureau for Astronomical Telegrams. The Minor Planet Center also operates under the IAU, and is a "clearinghouse" for all non-planetary or non-moon bodies in the Solar System. [9]
A terrestrial planet, tellurian planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate, rocks or metals. Within the Solar System , the terrestrial planets accepted by the IAU are the inner planets closest to the Sun : Mercury , Venus , Earth and Mars .