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What is a planet ?


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#1 Dark Ice Dragon

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Posted 21 March 2017 - 04:20 PM

A Group of  scientist of the NASA want make a  proposal for changes in the definition of planet at the Lunar and Planetary Science Conference, here you may read all the story :

 

https://tribune.com....d-solar-system/

Now, regardless the fact that Pluto will return to be a planet if the new definition will be accepted ( if this will happend i will open anothe discussion only on Pluto ), i will like know your opinion on this : What is a planet ?

 

are you agree whit the proposal of the new definition :

 

"  a planet is a substellar mass body that has never undergone nuclear fusion and that has sufficient self-gravitation to assume a spheroidal shape adequately descibed by a triaxial ellipsoid, regardless of its orbit parameters "

 

or you like more the actual one :

 

"a planet is a celestial body which :

1 - is in orbit around the Sun

2 - has sufficient mass to assume hydorstatic equilibium ( is nearly round shape  )

3 - has cleared the neighbourhood around its orbit."

 

or you think that must be something of different ? 

For me, is fine the actual one except  the 3° point, even the Earth don't fully clear the "neighbourhood", i will like delete the 3° point and modify the 1 whit : "is in orbit around the Sun and is not the satellite of another planet"


Edited by Dark Ice Dragon, 21 March 2017 - 04:26 PM.


#2 Lüt

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Posted 21 March 2017 - 05:04 PM

has sufficient self-gravitation to assume a spheroidal shape

I'll go with this.




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